Answer: y = 3x + 2
Step-by-step explanation: this is one more answer
Name each polynomial by degree and number of terms.
9) -2
11) 7k+3
10)-6³-9b
Please help
The first polynomial is a constant polynomial with degree of zero, the second polynomial is linear with degree of 1 and containing 2 terms.
9) The first polynomial is -2. it has no degree as there is no variable in the polynomial.
10) The second polynomial is 7k + 3 . The variable is k and it has the degree of one.
11) The third polynomial is -6b³-9b .
Here the variable b is raised to a power of 3, so the degree of this polynomial is 3 and there are 2 terms in the polynomial.
An equation that can be converted into a polynomial by adding, multiplying, and raising it to a non-negative integer number can be made from variables, other constants, and symbols.
Constants are any expressions that do not include indeterminates and describe mathematical things that can be multiplied and added to. They are frequently numbers.
The degree of a polynomial is the highest degree among its monomials (individual terms) with non-zero coefficients. The exponents of all the variables that appear in a term are added to get a non-negative number that represents the phrase's degree.
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Any point on the parabola can be labeled (x,y), as shown. What are the distances from the point (x,y) to the focus of the parabola and the directrix? Select two answers.
distance to the focus: (x+3)2+(y−3)2−−−−−−−−−−−−−−−√
distance to the focus: (x−2)2+(y+3)2−−−−−−−−−−−−−−−√
distance to the focus: (x+3)2+(y−2)2−−−−−−−−−−−−−−−√
distance to the directrix: |x−4|
distance to the directrix: |y−4|
distance to the directrix: |y+4|
Answer:
Step-by-step explanation:
Standard form of the equation:
y = \(-\frac{1}{4} (x+3)^2+3\)
Directrix: y=4
Focus: (-3,2)
Points on the parabola (x,y):
(-5,2) (-3,3) (-1,2)
Distance from points to focus:
(-5,2) = (-3,2)
Answer choices: (x+3)^2+(y−3)^2, (x−2)2+(y+3)2, (x+3)2+(y−2)2
(-5+3)^2+(2-3)^2=5
(-5-2)^2+(2+3)^2=74
(-5+3)^2+(2-2)^2=4
(-1,2)
What is the sum of these decimal numbers?
6.338+2.705+4.099
Answer:
13.142
Step-by-step explanation:
The sum of the decimal numbers will be 13.142.
What is Decimal number?
A decimal number is a number that consists of a whole and a fractional part.
Given that;
The expression of the decimal numbers are,
⇒ 6.338 + 2.705 + 4.099
Now,
Since, The expression of the decimal numbers are,
⇒ 6.338 + 2.705 + 4.099
Add the numbers as;
6.338
2.705
+4.099
-------------
13.142
Thus, The sum of the decimal numbers will be 13.142.
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In the U.S., shoe sizes are defined differently for men and women, but in Europe, both sexes use the same shoe size scale. The accompanying histogram shows the European shoe sizes of 269 male and female college students, converted from their reported U.S. shoe sizes. What might be the problem with either the mean or the median as a measure of center?
To accurately represent the shoe sizes for men and women separately, it would be better to compute the mean or median shoe size for each group separately and compare them.
The problem with either the mean or the median as a measure of center in this case is that the data is not separated by gender, and the shoe size distributions for men and women are likely to be different. Therefore, computing the mean or median shoe size across all students may not accurately represent the typical shoe size for men or women separately.
For example, if the men in the sample have, on average, larger shoe sizes than the women, then the mean shoe size across all students may be biased towards the larger sizes, even though the majority of the students are women. On the other hand, if there are a few male students with very large shoe sizes, then the median shoe size across all students may be biased towards the larger sizes as well, even if most of the students are women with smaller shoe sizes.
To accurately represent the shoe sizes for men and women separately, it would be better to compute the mean or median shoe size for each group separately and compare them. Alternatively, a better measure of center might be to report the mode, which represents the most common shoe size in the data.
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given a function f : a → b and subsets w, x ⊆ a, then f (w ∩ x) = f (w)∩ f (x) is false in general. produce a counterexample.
Therefore, f(w ∩ x) = {0} ≠ f(w) ∩ f(x), which shows that the statement f(w ∩ x) = f(w) ∩ f(x) is false in general.
Let's consider the function f: R -> R defined by f(x) = x^2 and the subsets w = {-1, 0} and x = {0, 1} of the domain R.
f(w) = {1, 0} and f(x) = {0, 1}, so f(w) ∩ f(x) = {0}.
On the other hand, w ∩ x = {0}, and f(w ∩ x) = f({0}) = {0}.
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Maths
I’ll give the brainiest
Answer:
x= 4/5
y= 2/5
Step-by-step explanation:
3x-y=2
2x+y=5
solve them so that they are in y=mx+b form
3x-y-3x=2-3x
-y= -3x+2
y= 3x -2
2x+y -2x= 2-2x
y= -2x+2
now use the substitution method to get your points
3x -2= -2x+2
3x -2+2= -2x+2+2
3x= -2x+4
3x+2x= -2x+4+2x
5x=4
x= 4/5
now substitute x into any of the 2 equations
y= 3x -2
y= 3(4/5) -2
y= 2 2/5 -2
y= 2/5
Hope this helped!
The value of a share of stock decreases in value at a rate of $2.70 per hour during the first 7.5 hours of trading. Enter and solve an equation to find the decrease in the value of the share of stock during that time. Let x represent the decrease in value of the share of stock during 7.5 hours.
PLS HELP
Answer:
20.25
Explanation
2.70 times 7.5 = x
2.70 times 7.5 = 20.25
What is the remainder of (x3+5x2−32x−7)÷(x−4) ? Enter your answer in the box.
Show all work please!
The remainder of the given division ( x³+5x²−32x−7 ) ÷ ( x−4 ) is equal to 9.
As given in the question,
Dividend of the given division is equal to : ( x³+5x²−32x−7 )
Divisor of the given division is equal to : ( x−4 )
Divide the given dividend ( x³+5x²−32x−7 ) by divisor ( x−4 ) remainder we get,
( x³+5x²−32x−7 )
= x³ -4x² +9x² -36x +4x-16 +9
= x²(x-4) + 9x (x-4) +4(x-4) + 9
= (x-4)(x² +9x +4) + 9
Quotient is equal to (x² +9x +4)
Remainder is equal to 9
Therefore, the remainder of the given division ( x³+5x²−32x−7 ) ÷ ( x−4 ) is equal to 9.
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Anyone? Know how to
Answer:
the first answer is maybe correct
A phone sells for $250. It is now on sale for 1/5 off the original price. April has a coupon for an extra 10% off the sale price. To the nearest dollar, how much less than the original price will April pay for the phone? *
Answer:
She will pay $75.00 less.
Step-by-step explanation:
To get ⅕ of 250, divide it by 5. (250÷5=50)
You also need to take 10% off of the original price. To do that, multiply 250 by 0.1. (250×0.1=25)
In total, she will pay $75.00 less, or $175.00. (50+25=75) (250-75=175)
Determine the t-percentile that is required to construct each of the following two-sided confidence intervals: (a) Confidence level =95%, degrees of freedom =15 (b) Confidence level =95%, degrees of freedom =24 (c) Confidence level =99%, degrees of freedom =13 (d) Confidence level =99.9%, degrees of freedom =15
The t-percentile defines the boundaries of the confidence interval and is equal to the critical value of t with a positive or negative sign, depending on whether the confidence interval is one-sided or two-sided.
A t-distribution table determines the t-percentile required to construct two-sided confidence intervals. The first step in determining the t-percentile is to know the degrees of freedom and confidence level. The next step is to find the critical value of t from a t-distribution table. The t-distribution table lists values for the probability density function, cumulative distribution function, and percentile points of the t-distribution.
The table is arranged in rows and columns, with the rows corresponding to the degrees of freedom and the columns corresponding to the significance level. The critical value of t is the value that separates the central area of the t-distribution from the tails of the distribution. It is used to define the boundaries of the confidence interval. The t-value is the same as the critical value of t, but it has a positive or negative sign depending on whether the confidence interval is one-sided or two-sided. The t-percentile that is required to construct two-sided confidence intervals is given by the following steps:
Step 1: To determine the t-percentile, the degrees of freedom and confidence level are needed.
Step 2: Find the critical value of t from a t-distribution table.
(a) 95% confidence level, 15 degrees of freedom.
Using the T-Distribution Calculator with degrees of freedom (df) = 15, a 95% confidence level, the value of t is found to be 2.1318. Therefore, to construct the confidence interval, the t-value is ± 2.1318.
(b) 95% confidence level, 24 degrees of freedom.
Using the T-Distribution Calculator with degrees of freedom (df) = 24, a 95% confidence level, the value of t is 2.064. Therefore, to construct the confidence interval, the t-value is ± 2.064.
(c) 99% confidence level, 13 degrees of freedom.
Using the T-Distribution Calculator with degrees of freedom (df) = 13, a 99% confidence level, the value of t is 3.012. Therefore, to construct the confidence interval, the t-value is ± 3.012.
(d) 99.9% confidence level, 15 degrees of freedom.
Using the T-Distribution Calculator with degrees of freedom (df) = 15, a 99.9% confidence level, the value of t is found to be 3.579. Therefore, to construct the confidence interval, the t-value is ± 3.579.
The t-percentile can be found using a t-distribution table, which lists the critical value of t for different degrees of freedom and significance levels. The t-percentile defines the boundaries of the confidence interval and is equal to the critical value of t with a positive or negative sign, depending on whether the confidence interval is one-sided or two-sided.
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WILL GIVE BRAINLIEST
PLEASE HELP FAST!!
Angelica uses the points (4,3) to represent the location of her house and use the point (10,8) to represent the location of a gas station. This unit on the graph represents 1 mi. Use Pythagorean theorem to determine how far the gas station is from Angelica’s house show your work.
Answer:
Angelica’s house is 7.81 miles from the gas station
Step-by-step explanation:
By pythogorean theorem, AG² = AP² + GP²
A (4,3), G(10,8), P(10,3)
Since AP lies along the x axis, the distance is calculated using the x coordinates of A and P
AP = 10 - 4 = 6
GP lies along the y axis, so the distance is calculated using the y coordinates of G and P
GP = 8 - 3 = 5
AG² = 6² + 5²
= 36 + 25
AG² = 61
AG = √61
AG = 7.81
5. State if the following statements are true or false. If true, give a 1-3 line explanation; otherwise, provide a counter example or explanation. No rigorous formal justification needed. (a) The set {x∈R
n
∣Ax=b} is convex, where A∈R
m×n
,b∈R
m
. (b) The set {(x
1
,x
2
)∣x
2
≤3x
1
2
} is convex. (c) All polygons on the R
2
plane are convex. (Hint: A polygon is a plane figure formed with straight line segments.) (d) If S⊆R
2
is convex, then S must enclose a region of finite area. (e) If S
1
,S
2
⊆R
2
and S
1
∩S
2
=ϕ, then S
1
∪S
2
must be non-convex. (f) If S
1
,S
2
⊆R
2
and both S
1
,S
2
are closed, then S
1
∪S
2
must be non-convex.
(a) False. The set {x∈R^n | Ax=b} is not necessarily convex. It depends on the matrix A and the vector b. For example, if A is a non-convex matrix, then the set of solutions {x∈R^n | Ax=b} will also be non-convex.
(b) True. The set {(x₁,x₂) | x₂ ≤ 3x₁²} is convex. The inequality defines a downward parabolic region, and any line segment connecting two points within this region will lie entirely within the region. (c) False. Not all polygons on the R² plane are convex. For example, a polygon with a concave portion, such as a crescent shape, would not be convex.
(d) True. If S⊆R² is convex, then it must enclose a region of finite area. Convex sets do not have "holes" or disjoint parts, so they form a connected and bounded region. (e) False. If S₁⊆R² and S₂⊆R², and S₁∩S₂=ϕ (empty set), then S₁∪S₂ can be convex. If S₁ and S₂ are both convex sets that do not overlap, their union can still be a convex set. (f) True. If S₁⊆R² and S₂⊆R² are both closed sets, then their union S₁∪S₂ must also be closed. However, it may or may not be convex. The convexity of the union depends on the specific sets S₁ and S₂.
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during the weekend Michael took 6 and 3/7 hours to do his homework, 4.37 hours to clean his room and then walked his dog for 2/3 of an hour. How much time did he work on the weekend?
We conclude that Michael worked for a total of 11.46 hours in the weekend.
How much time did he work on the weekend?We know that during the weekend, the times that he used for each task are:
(6 + 3/7) hours to do his homework.4.37 hours to clean his room.2/3 hours to walk the dogThe total time is given by the sum between the above numbers, where the difficulty is the fact that the 3 numbers are in different notations (decimal, fraction, and mixed).
The sum is:
S = (6 + 3/7) h + 4.37 h + 2/3 h
The easier way to do this, is to write the 3 numbers in decimal form:
2/3 = 0.66
6 + 3/7 = 6 + 0.43 = 6.43
Then the total time is:
S = 6.43 h + 4.37h + 0.66h = 11.46 h
We conclude that Michael worked for a total of 11.46 hours in the weekend.
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Point A is located at (0, 4), and point B is located at (−2, −3). Find the x value for the point that is 1 over 4 the distance from point A to point B. −1. 5 −2 −0. 5 −1.
The prism below is being wrapped for Christmas. How many square feet will Mrs. Harris need to wrap the prism ?
We need to calculate the surface area
We have 6 faces and three different rectangles
The red rectangles are equals
The green rectangles are equals
The blue rectangles are equals
The formula for the area of a rectangle is
\(A=l\times w\)where
l is the length
w is the width
The area for one red rectangle
l=10
w=5
\(A_R=10\times5=50\)The area for one green rectangle is
l=10
w=7
\(A_G=10\times7=70\)The area for one blue rectangle
l=7
w=5
\(A_B=7\times5=35\)The total area is
\(A=2A_R+2A_G+2A_B=2(50)+2(70)+2(35)=100+140+70=310in^2\)Then we need to transform the square inches to square feet
1 square ft = 144 square inches
x square ft = 310 square inches
\(x=\frac{310}{144}=2.15\text{ }\)Mrs Harris will need 2.15 square ft to wrap the prism
Write an absolute value inequality to represent each situation.
A friend is planning a trip to Alaska. He purchased a coat that is recommended for outdoor temperatures from -15⁰ F to 45⁰F . Let t represent the temperature for which the coat is intended.
Answer: |t - 15| ≤ 30 ; -30 ≤ t - 15 ≤ 30
Step-by-step explanation:
To set up the equation, we have to find the center, and the tolerance, so that we can use formula "|x - c| ≤ t"
First, we can find the tolerance by adding both number, then dividing by 2 --> -15 + 45 = 30 --> 30/2 = 15, so we now know that the center is 15
Next, we can find the tolerance by finding the distance between the center and one of the number --> 15 - (-15) = 30, so we now know that the tolerance is 30
Now we can set up our equation,
center (c) = 15
tolerance (t) = 30
|t - 15| ≤ 30
Now that we have our equation, we can set up the inequality
|x - c| ≤ t = -t ≤ x - c ≤ t
so,
-30 ≤ t - 15 ≤ 30
Hope this helps!
(sorry it was so long)
9th grade
Which of the following correctly translates this equation?
5x - 7=3
o
Seven times a number decreased by 5 is 3
o Seven minus the product of 5 and a number is 3
o Seven less than 5 times a number is 3
o Five minus the product of 7 and a number is 3
Answer:
May be the second one
Step-by-step explanation:
hope it'll help ☺️
The correct translation of the equation 5x - 7 = 3 is "Seven less than 5 times a number is 3."
This translation accurately reflects the given equation. The term "5 times a number" represents 5x, indicating that the number is multiplied by 5. The term "Seven less than" signifies that 7 is subtracted from the result of 5 times a number. Finally, the phrase "is 3" states that the resulting expression is equal to 3. Therefore, the translation "Seven less than 5 times a number is 3" captures the essence of the equation 5x - 7 = 3 in a concise and accurate manner.
Therefore, The correct translation of the equation 5x - 7 = 3 is "Seven less than 5 times a number is 3."
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Describe the difference between the graphs you made by the Man walking slowly and those made by the Man walking more quickly
The graphs for the man walking slowly and walking quickly differ in various ways. Graphs are graphical representations of data that display how two variables relate to each other. Time is plotted on the x-axis, whereas the distance travelled by the man is plotted on the y-axis. A line graph is used to plot the data in each case.
The following are the differences between the graphs for the man walking slowly and quickly: Graphs for a man walking slowly: When the man walks slowly, the slope of the line graph is relatively gentle. In a given time interval, the man walks a shorter distance. As a result, the graph's slope will be less steep. The graph's slope increases as the man's pace slows down. Graphs for a man walking quickly:
When the man walks quickly, the slope of the line graph is steep. The man will walk a more extended distance in the same amount of time. As a result, the graph's slope will be more significant. The graph's slope will decrease as the man's pace increases.Based on the above information, we can conclude that the slope of the graph depends on how quickly or slowly the man walks. Therefore, the graphs for the man walking slowly and quickly differ in slope.
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Find the exact value, without a calculator. sin(5pi/12) = sin(5pi/6/2)
Answer:
\(\frac{\sqrt{2 + \sqrt{3} } }{2}\)
The exact value of \(sin\frac{5\pi }{12}\) is \(\frac{\sqrt{2+\sqrt{3} } }{2}\).
What is exact value of trigonometric function?The exact values of trigonometric functions are values of trigonometric functions of certain angles that can be expressed exactly using expressions containing real numbers and roots of real numbers.
According to the given question, we have
A trigonometric function, \(sin\frac{5\pi }{12}\)
Now, the exact value of \(sin\frac{5\pi }{12}\) is given by
\(sin\frac{5\pi }{12} = sin\frac{\frac{5\pi }{6} }{2}\)
⇒\(sin\frac{\frac{5\pi }{6} }{2} =\)±\(\sqrt{\frac{1-cos\frac{5\pi }{6} }{2} }\)
⇒\(sin\frac{\frac{5\pi }{6} }{2}\) =±\(\sqrt{\frac{1-cos(\pi -\frac{\pi }{6}) }{2} }\)
⇒\(sin\frac{\frac{5\pi }{6} }{2} =\) ±\(\sqrt{\frac{1+cos\frac{\pi }{6} }{2} }\)
⇒ \(sin\frac{\frac{5\pi }{6} }{2} =\) ± \(\sqrt{\frac{1+\frac{\sqrt{3} }{2} }{2} }\)
⇒\(sin\frac{\frac{5\pi }{6} }{2}\) =± \(\sqrt{\frac{2+\sqrt{3} }{4} }\)
⇒\(sin\frac{\frac{5\pi }{6} }{2} = \frac{\sqrt{2+\sqrt{3} } }{2}\) (considering positive value)
Since, \(sin\frac{5\pi }{12}\) lies in first quadrant and sin is positive in first quadrant. Therefore, we will consider only positive value.
Hence, the exact value of \(sin\frac{5\pi }{12}\) is \(\frac{\sqrt{2+\sqrt{3} } }{2}\).
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HELP HELPL HELP HELP HELP HELP HELP HELP
Answer:
Part A: 120000000 is the difference
Part B: A 8 minutes, 20 seconds
Step-by-step explanation:
I'm an expert
list the clusters, gaps, outliers, and shape of this dot plot please!
Answer:
Cluster : 60,61,62,63
Gaps: 64,65 , 69,70
Outlier: 71
This is what I learned so don't blame me please!
Step-by-step explanation:
Cluster is numbers all on one side. Outlier can be the largest number or lowest. Normally the alone one.
Answer the picture please
Answer:
42 miles ≈ 68 km
35 km ≈ 22 miles
150 miles ≈ 252 km
Step-by-step explanation:
1 mile ≈ 1.6 km - just look at the picture
What is the average rate of change of the function f(x)=120(0. 1)x from x = 0 to x = 2? Enter your answer, as a decimal, in the box. Do not round your answer.
The average rate of change of the function is -59.4
The formula for calculating the rate of change of the function is expressed as:
\(f'(x)=\frac{f(b)-f(a)}{b-a}\)
Given the function
\(f(x)=120(0.1)^x\\f(0) = 120(0.1)^0\\f(0)=120\\\)
Get the value of f(2)
\(f(2)=120(0.1)^2\\f(2) = 120(0.1)^2\\f(2)=1.2\\\)
Substitute into the formula to have:
\(f'(x)=\frac{1.2-120}{2-0}\\f'(x)=\frac{118.8}{2} \\f'(x)= -59.4\)
Hence the average rate of change of the function is -59.4
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Two friends, Houa and Lincoln, had just bought their first cars. Lincoln uses 7 gallons of gas to drive 214.9 miles in his car. The graph below represents the number of miles, y, that Houa can drive her car for every x gallons of gas.
Based on the information provided, it can be concluded that Houa can drive 125 miles for 7 gallons of gas.
How to calculate the number of gallons that Houa can drive?To determine the number of gallons this person can drive, just observe the graph presented and determine the value of Y (miles driven) when the value of x (gallons of gas) is 7. Based on this principle it can be concluded that for 7 gallons Houa can drive 125 miles.
This implies that if we compare both cars (Houa's and Lincoln's), the car that requires less gasoline is Lincoln's car.
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What are all values of x for which the function f defined by f(x) = (x2 - 3)e-x is increasing?.
The function f is increasing for x > 3/2.
To determine the values of x for which the function f is increasing, we need to find the critical points of f, which are the values of x where the function changes from increasing to decreasing or vice versa.
The first step is to find the derivative of f:
f'(x) = (2x - 3)e-x
Next, we need to find the critical points by setting f'(x) = 0 and solving for x:
(2x - 3)e-x = 0
2x - 3 = 0
x = 3/2
This is the only critical point of f. To determine the behavior of f near this critical point, we need to find the second derivative of f:
f''(x) = (2 - 3e-x)
For x < 3/2, f''(x) < 0, which means f is concave down and f'(x) is decreasing. This means that f is decreasing for x < 3/2.
For x > 3/2, f''(x) > 0, which means f is concave up and f'(x) is increasing. This means that f is increasing for x > 3/2.
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The following table shows the number of candy bars bought at a local grocery store and the
total cost of the candy bars:
Candy Bars: 3, 5, 8, 12, 15, 20, 25
Total Cost: $6.65, $10.45, $16.15, $23.75, $29.45, $38.95, $48.45
If B represents the number of candy bars purchased and C represents the total cost of the candy bars, write the linear model that models the cost of any number of candy bars.
The linear model that represents the cost of any number of candy bars can be written as: C = $1.90B + $0.95
To write the linear model that models the cost of any number of candy bars, we need to find the equation of a line that best fits the given data points. We'll use the variables B for the number of candy bars purchased and C for the total cost of the candy bars.
Looking at the given data, we can see that there is a linear relationship between the number of candy bars and the total cost. As the number of candy bars increases, the total cost also increases.
To find the equation of the line, we need to determine the slope and the y-intercept. We can use the formula for the equation of a line: y = mx + b, where m is the slope and b is the y-intercept.
First, let's find the slope (m) using two points from the given data, for example, (3, $6.65) and (25, $48.45):
m = (C2 - C1) / (B2 - B1)
= ($48.45 - $6.65) / (25 - 3)
= $41.80 / 22
≈ $1.90
Now, let's find the y-intercept (b) using one of the data points, for example, (3, $6.65):
b = C - mB
= $6.65 - ($1.90 * 3)
= $6.65 - $5.70
≈ $0.95
Therefore, the linear model that represents the cost of any number of candy bars can be written as:
C = $1.90B + $0.95
This equation represents a linear relationship between the number of candy bars (B) and the total cost (C). For any given value of B, you can substitute it into the equation to find the corresponding estimated total cost of the candy bars.
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A breathalyser test is used by police in an area to determine whether a driver has an excess of alcohol in their blood. The device is not totally reliable: 6 % of drivers who have not consumed an excess of alcohol give a reading from the breathalyser as being above the legal limit, while 10 % of drivers who are above the legal limit will give a reading below that level. Suppose that in fact 17 % of drivers are above the legal alcohol limit, and the police stop a driver at random. Give answers to the following to four decimal places. Part a) What is the probability that the driver is incorrectly classified as being over the limit? 0.333 Part b) What is the probability that the driver is correctly classified as being over the limit? Part c) Find the probability that the driver gives a breathalyser test reading that is over the limit. Part d) Find the probability that the driver is under the legal limit, given the breathalyser reading is also below the limit.
a) The probability that the driver is incorrectly classified as being over the limit is 0.06.
b) The probability that the driver is correctly classified as being over the limit is 0.90.
c) The probability that the driver gives a breathalyser test reading that is over the limit is 0.222.
d) The probability that the driver is under the legal limit, given that the breathalyser reading is below the limit, is 0.944.
Part a) To calculate the probability that the driver is incorrectly classified as being over the limit, we need to consider the probability of a false positive. This occurs when a driver who has not consumed an excess of alcohol is classified as being over the limit.
Given that 6% of drivers who have not consumed an excess of alcohol give a reading above the legal limit, the probability of a false positive is 0.06.
Therefore, the probability that the driver is incorrectly classified as being over the limit is 0.06.
Part b) The probability that the driver is correctly classified as being over the limit is the complement of the probability of a false negative. A false negative occurs when a driver who is above the legal limit gives a reading below that level.
Given that 10% of drivers who are above the legal limit give a reading below the limit, the probability of a false negative is 0.10.
Therefore, the probability that the driver is correctly classified as being over the limit is 1 - 0.10 = 0.90.
Part c) To find the probability that the driver gives a breathalyser test reading that is over the limit, we need to consider both the drivers who are above the legal limit and incorrectly classified as being over the limit (false positive) and the drivers who are above the legal limit and correctly classified as being over the limit.
The probability of a breathalyser test reading that is over the limit is the sum of these two probabilities: the probability of a false positive (0.06) and the probability of correctly classifying a driver who is above the limit (0.17 * 0.90).
Therefore, the probability that the driver gives a breathalyser test reading that is over the limit is 0.06 + (0.17 * 0.90) = 0.222.
Part d) To find the probability that the driver is under the legal limit, given that the breathalyser reading is also below the limit, we need to consider the drivers who are below the legal limit and correctly classified as being below the limit (true negative) and the drivers who are below the legal limit and incorrectly classified as being over the limit (false positive).
The probability of a driver being under the legal limit, given that the breathalyser reading is below the limit, is the probability of a true negative divided by the sum of the probabilities of a true negative and a false positive.
The probability of a true negative is 1 - the probability of a false positive (0.06).
Therefore, the probability that the driver is under the legal limit, given that the breathalyser reading is below the limit, is (1 - 0.06) / (1 - 0.06) + 0.06 = 0.944.
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he accompanying histogram shows the life expectancies at birth for 190 countries as collected by an international health agency.
a) Which would you expect to be larger: the median or the mean? Explain briefly.
b) Which would you report: the median or the mean? Explain briefly.
a) The median would be larger than the mean because the life expectancy of some countries may be much lower than the others, thus affecting the mean.
b) The median should be reported as it is a better measure of central tendency, as it is not affected by outliers.
a) The median is expected to be larger than the mean because the life expectancy of some countries may be much lower than the others, thus affecting the mean. The mean is calculated by adding all the values together and dividing by the number of values, and if there are any values that are much lower or higher than the rest, this will affect the mean significantly. The median, however, is the midpoint of the values, so outliers have less of an influence on it.
b) The median should be reported as it is a better measure of central tendency, as it is not affected by outliers. The median is the midpoint of the values, which means that if there are any values that are much lower or higher than the rest, it will not affect the median as much as it does the mean. This makes the median more accurate in representing the life expectancy of countries, as it is not skewed by outliers. Furthermore, the median is generally more reliable when dealing with skewed distributions, which is often the case with life expectancy data.
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TRUE/FALSE. in a probability model, the sum of the probabilities of all outcomes must equal 1.
Answer:
True
Step-by-step explanation:
The probabilities of all outcomes add to 1.