81% of the money spent at full-service restaurants in America takes place by debit, credit, or pre-paid cards. One restaurant kept data for the week, and found that 421 of it's 973 customers used either debit, credit, or pre-paid cards to pay for their meal that week. Choose all possible reasons for the discrepancy in the results.

Choices:
1. The theoretocal probability is not calculated correctly

2. The experiment is flawed

3. Enough trials have not been performed to give the desired result.

4. There is no discrepancy in the result
choose all answers that apply. ​

Answer:

true

Step-by-step explanation:

Adjacent angles are two angles that have a common side and a common vertex (corner point) but do not overlap in any way.

\(7\frac{1}{2}\implies 7.5\hspace{5em}1\frac{1}{4}\implies 1.25 \\\\[-0.35em] ~\dotfill\\\\ \stackrel{ \textit{Monday through Friday} }{\stackrel{ days }{(5)}\stackrel{ rate }{(10.80)}\stackrel{ hours }{(7.5)}}~~ + ~~\stackrel{ Saturday }{\stackrel{ days }{(1)}\stackrel{ rate }{(10.80)(1.25)}\stackrel{ hours }{(7.5)}} \\\\\\ 405~~ + ~~101.25\implies \text{\LARGE 506.25}\)

The pump that has many of the same components as an end-suction flexibly coupled pump but does not employ a pump shaft or pump bearing assembly is known as a canned motor pump.

A canned motor pump is a type of centrifugal pump that is typically used for low flow rates and high head applications. A canned motor pump is a form of centrifugal pump that uses an electric motor to power the impeller in the pump. The motor and the pump are typically sealed together, with the motor rotor and the pump impeller both fixed to a common shaft.

What makes the canned motor pump different from other centrifugal pumps is the absence of the pump shaft and pump bearing assembly. Instead of using a pump shaft and bearing assembly, the canned motor pump utilizes a motor rotor that is directly connected to the impeller of the pump. The motor and the pump are sealed together in a single unit, which eliminates the need for a pump shaft or bearing assembly.

The canned motor pump is advantageous for several reasons. The elimination of the pump shaft and bearing assembly increases the reliability of the pump and reduces the likelihood of mechanical failure.

Additionally, the design of the canned motor pump allows for a more compact unit, which saves space in applications where space is limited.

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Answer: 2.5

Step-by-step explanation:

3 1.4 lbs also equals 3.25

3 x 0.75 = 2.25

2.25 + 25 = 2.5

Answer:

ŷ = bX + a

Step-by-step explanation:

a. There is a 0.6827 percent chance that the random variable will take on a value between 45 and 55. b. There is a 0.9545 percent chance that the random variable will take on a value between 40 and 60.

a. To find the probability that the random variable will assume a value between 45 and 55, we need to calculate the z-scores for each value and then use a standard normal distribution table or calculator.

The z-score for 45 is:

\(z = (45 - 50) / 5 = -1\)

The z-score for 55 is:

\(z = (55 - 50) / 5 = 1\)

Using a standard normal distribution table or calculator, we find the probability of the random variable assuming a value between 45 and 55 is:

P(-1 < Z < 1) = 0.6827 (to 4 decimals)

As a result, there is a 0.6827 percent chance that the random variable will take a value between 45 and 55.

b. To find the probability that the random variable will assume a value between 40 and 60, we again need to calculate the z-scores for each value and then use a standard normal distribution table or calculator.

The z-score for 40 is:

\(z = (40 - 50) / 5 = -2\)

The z-score for 60 is:

\(z = (60 - 50) / 5 = 2\)

Using a standard normal distribution table or calculator, we find the probability of the random variable assuming a value between 40 and 60 is:

P(-2 < Z < 2) = 0.9545 (to 4 decimals)

Hence, there is a 0.9545 percent chance that the random variable will take on a value between 40 and 60.

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The expected value of the sample mean, denoted as E(µ), is equal to the population mean µ, while the population variance of the sample mean, denoted as Var(µˆ), is equal to the population variance σ² divided by the sample size n. Therefore, the expected value of the sample mean is µ, and the population variance of the sample mean is σ²/n.

The expected value (mean) of the sample mean, denoted as E(µ), is equal to the population mean µ. In other words, E(µ) = µ.

The population variance of the sample mean, denoted as Var(µ), is equal to the population variance σ² divided by the sample size n. In other words, Varµ) = σ²/n.

So, to summarize:

Expected value of the sample mean: E(µ) = µ

Population variance of the sample mean: Var(µ) = σ²/n

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The number of marbles of the color white, if A jar contains 350 marbles of two colors of all the marbles, 4 out of every 7 marbles are white, is 200.

Probability is a branch of mathematics that deals with numerical representations of the likelihood of an event occurring or of a proposition being true. The probability of an event is a number between 0 and 1.

Given:

A jar contains 350 marbles, n = 350,

4 out of every 7 marbles are white,

Calculate the number of whites balls as shown below,

Number of one white ball in 7 marbles = 4 / 7

Number of white balls in 350 marbles =  4 / 7 × 350

Number of white balls in 350 marbles = 200

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Answer:

\(x=\pm 3\)

Step-by-step explanation:

\(12=x^2 + 3 \\ \\ x^2 = 9 \\ \\ x=\pm 3\)

Given data:

The given right angle triangle.

The expression for the value of x is,

Thus, the value of x is 16.1 units.

Answer: Finding the area for a right triangle is really simple so I will just show you how too.

Step-by-step explanation:

I was taught that it was H × B ÷2  (make sure to use this formula on right triangles)

B=base

H=height

Its really similar to finding area of a rectangle but you just divide your answer by 2 at the end!

I hope that helps a bit.

(if you worried that you didn't do it correct I got 336 for number 1)

Answer:

What is the law of large numbers? 

In probability theory, the law of large numbers is a theorem that describes the result of performing the same experiment a large number of times. 

What does it tell us about samples as they get larger and approach infinity?

As sample sizes increase, the sampling distributions approach a normal distribution. With "infinite" numbers of successive random samples, the mean of the sampling distribution is equal to the population mean (µ).

Hope this helps :)

Pls brainliest...

Answer:

Solution of x=y+4 & 2x-3y= - 2 is at (14,10)

So, answere is D

Hope this helps!

Judgment sampling is sometimes preferred over random sampling, for example when C) time is short, and the sampling budget is limited.

Judgment sampling, also known as purposive sampling, is a type of non-probability sampling where the researcher selects the sample based on their own judgment or knowledge of the population.

This type of sampling is often preferred when time is short and the sampling budget is limited, as it allows the researcher to quickly select a sample that they believe will be representative of the population.

In contrast, random sampling, which is a type of probability sampling, involves selecting a sample at random from the population.

This type of sampling is generally considered to be more accurate and representative of the population, but it can be more time-consuming and expensive than judgment sampling.

Therefore, the correct answer to the question "Judgment sampling is sometimes preferred over random sampling, for example when" is C. time is short and the sampling budget is limited.

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The type of relationship indicated in the scatterplot is a negative curvilinear relationship.

A scatterplot is a type of graph that is used to display the relationship between two variables. In a scatterplot, the values of one variable are plotted on the x-axis and the values of the other variable are plotted on the y-axis. The relationship between the two variables can be determined by observing the pattern of the points in the scatterplot.

A negative curvilinear relationship is indicated when the points in the scatterplot form a curve that slopes downward. This means that as the values of one variable increase, the values of the other variable decrease, but not in a straight line. Instead, the relationship follows a curved pattern.

In contrast, a positive linear or curvilinear relationship is indicated when the points in the scatterplot form a curve that slopes upward, a negative linear relationship is indicated when the points in the scatterplot form a straight line that slopes downward, and no relationship is indicated when the points in the scatterplot do not form any discernible pattern.

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The following formula is used: P(n,r) = n! / (n - r)! to the calculate  the number of permutations.

The formula used to calculate the number of permutations when a permutation is any arrangement of r objects

selected from n possible objects is P(n,r).

P(n,r) is the formula used to calculate the number of permutations.

Let us try to understand the concept of permutations first.

Permutations refer to the different ways of arranging elements.

It is represented as nPr called as n-permute-r.

Here, n represents the total number of elements present, and r represents the number of elements taken for each

permutation.

To calculate the number of permutations, the following formula is used:

P(n,r) = n! / (n - r)!

Where n! is equal to n-factorial that refers to the product of all numbers starting from 1 up to n.

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Answer:

70 in²

Step-by-step explanation:

Answer:

50

Step-by-step explanation:

P- Parenthesis

E- Exponents

M- Multiplication

D- Division

A- Addition

S- Subtraction

(3²+4²)

3*3= 9     4*4= 16     16+9= 25      2(25)      25*2= 50

Hope this helped! (ﾉ◕ヮ◕)ﾉ*:･ﾟ✧

( ﾟдﾟ)つ Bye

Answer:

Step-by-step explanation:

−3   (x+2)   =    −18

(−3)   (x)  +  (−3)   (2)  =  −18                                    (Distribute)

−3x    +   −6   =    −18

−3x   −6   =   −18

−3x  −6   +6    =  −18  +  6

−3x=  −12

−3x/−3     =   −12/−3

x   =   4

When a cylinder is intersected by a plane parallel to the bases, the resulting cross-section is a circle.

A cylinder is a solid geometric figure which has two parallel, congruent bases.

The bases are connected by a curved surface called a lateral surface. If a plane is made to intersect a cylinder, the resulting cross-section can be circular or elliptical, depending on how the plane intersects the cylinder.

In this case, if the plane intersects the cylinder parallel to the bases, the resulting cross-section is a circle because any section taken parallel to the base of a cylinder is congruent to the base.

This is true for both right cylinders and oblique cylinders.

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In a nonexperimental method, relationships between variables are studied by making observations or measures of the variables of interest.

Research without either the manipulation of an independent variable, the random assignment of individuals to conditions or orders of conditions, or both, is referred to as non-experimental research.

The non-experimental study is entirely dependent on variables that the researcher has no control over. By whatever means, they cannot manipulate, control, or change the subjects. Thus, all they can do is continue their research while monitoring and interpreting their subjects.

It is safe to assume that a non-experimental research design is used when there is no specific cause-effect study problem and the researcher simply wants to grasp a topic in depth without constraining it with variables. They examine the natural phenomena as they take place.

Therefore, in a nonexperimental method, relationships between variables are studied by observing or measuring the variables of interest.

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We get m∠6 > m∠8 by using statement A ∠2 + ∠3 + ∠6 = 180 and statement C ∠1 + ∠2 + ∠3 + ∠4 + ∠8 = 180.

In the figure, we have 2 triangles. One is formed by angles, ∠2, ∠3, ∠6, and the other is formed by the sides that make up (∠1 , ∠2) , (∠3 , ∠4) and ∠8

Now the sum of all angles in a triangle are 180

Hence we get

∠2 + ∠3 + ∠6 = 180                                

Also,

∠1 + ∠2 + ∠3 + ∠4 + ∠8 = 180

From the above 2 equations we get

∠1 + ∠2 + ∠3 + ∠4 + ∠8 = ∠2 + ∠3 + ∠6

or, ∠1 + ∠4 + ∠8 = ∠6

Since no angle can be negative, ∠6 is clearly greater than ∠8

Hence we get m∠6 > m∠8 by using the statements  A and statement C.

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The remaining side is 16.9 and remaining angles are 83.1 and 34.9.

The cosine formula to find the side of the triangle is given by:

c = √[a² + b² – 2ab cos C] Where a,b and c are the sides of the triangle.

Given:

m∠B = 62°, a = 11, and c = 19

Now, b² = a² + c² - 2ac cos B.

b = √ a² + c² - 2ac cos B

b = √ 11² + 19² - 2x 11  x 19 cos 62

b= 16.9

Now. a/ sin A = b/ sin B= c/ sin C

So, <C = arc sin ( c sin B /b)

<C = arc sin ( 19 sin 62 /16.9)

<C = 83.1

and, <A = arc sin ( a sin B /b)

<A = arc sin ( 11 sin 62 /16.9)

<A = 34.9

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Answer:

Step-by-step explanation:

She read 30 pages in 25 minutes.

Rise over run is slope. Find the slope. That is the rate of change.

the y coordinate is (0,0)

The equation that best describe the graph is

Examining the graph shows that the graplh has its zeros at

x= -2 and x = -5

These value will be used to form the required equation as follows

x = -2

x + 2 = 0

x = -5

x + 5 = 0

(x + 2)(x + 5)

Expanding results to

= x² + 5x + 2x + 10

= x² + 7x + 10

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If A square ABCD has sides of length 4 units, and M is the midpoint of CD then The coordinates of point P can be (2, √6) or (2, -√6).

Given that A is the origin (0,0) and B is located at (4,0), we can find the coordinates of point P by considering the intersection of the two circles.

Since M is the midpoint of CD, the coordinates of M can be found by averaging the x-coordinates and y-coordinates of C and D. The x-coordinate of M is 2 (average of 0 and 4), and the y-coordinate of M is 0.

Considering the circle with radius 2 and center M, we know that point P lies on this circle. The equation of this circle is (x - 2)^2 + (y - 0)^2 = 2^2.

Substituting the x-coordinate of B into the equation, we can solve for the y-coordinate of P. This results in two possible solutions: y = √6 and y = -√6.

Therefore, the coordinates of point P can be (2, √6) or (2, -√6).

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Answer:

The Sierpinski triangle is also called the Sierpinski gasket.

Step-by-step explanation:

The Sierpinski triangle is a fractal and attractive fixed set named after the Polish mathematician Wacław Sierpiński who described it in 1915.

False , the variance and standard deviation are not measures of central location

Given data ,

The variance and standard deviation are not measures of central location but measures of dispersion or spread of a dataset

Measures of central location include the mean, median, and mode, which represent the typical or central value of a dataset

The variance and standard deviation are measures of dispersion or spread in a dataset. They provide information about how the values in a dataset are spread out around the mean.

In order to understand the variability or dispersion of data points within a dataset, one must take into account both the variance and standard deviation. They provide information on the range of values and aid in calculating how far away from the mean certain data points are. In statistics and data analysis, these metrics are frequently used to comprehend and evaluate the variance of various datasets.

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The value of u is not provided, we cannot determine the exact value of y. None of the given options (a, b, c, d) can be chosen as the approximate value of y.

For the first question, you are given the model yhat = 2.1 + 1.0x^2 and you want to find the estimated marginal effect of x on y when x = 1.3. To find the estimated marginal effect, you need to take the derivative of yhat with respect to x. In this case, the derivative would be 2.0x.

Now, substitute x = 1.3 into the derivative:

2.0(1.3) = 2.6.

Therefore, the estimated marginal effect of x on y when x = 1.3 is 2.6.

For the second question, you are given the model \(lny = β₁ + β₂x^2 + u\), with parameter estimates

β₁ = 2 and

β₂ = 1.

To predict the value of y when x = 2, substitute the given values into the model:
\(lny = 2 + 1(2^2) + u\)
lny = 2 + 1(4) + u
lny = 2 + 4 + u
lny = 6 + u

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Answer:

diameter is 28

Step-by-step explanation:

615.75216/3.14=196.099

\(\sqrt{196}\)=14

14*2=28