The expression 7+7x is equivalent to the expression

Mathematics

2 answers:

lianna [129]4 years ago

8 0

Answer:

x+1/7

Step-by-step explanation:

natta225 [31]4 years ago

5 0

X+1/7 is the answer to this question

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How can relative frequencies be used to help us estimate probabilities occurring in sampling distributions? relative frequencies

morpeh [17]

The <u>correct answer</u> is:

<span>Relative frequencies are the probabilities occurring in sampling distributions.

Explanation:

Relative frequencies are the fraction of times an event occurs within a sample.

This is the same definition as experimental probability; thus relative frequencies are the probabilities occurring in sampling distributions.</span>

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4 years ago

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castortr0y [4]

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4 years ago

Data were collected on the amount spent by 64 customers for lunch at a major Houston restaurant. These data are contained in the

galina1969 [7]

Answer:

a. The margin of error is 2.29.

b. 19.23 to 23.81

Step-by-step explanation:

The sample size is n=64.

We start by calculating the sample mean and standard deviation with the following formulas:

$M=\dfrac{1}{n}\sum_{i=1}^n\,x_i\\\\\\s=\sqrt{\dfrac{1}{n-1}\sum_{i=1}^n\,(x_i-M)^2}$

The sample mean is M=21.52.

The sample standard deviation is s=6.89.

We have to calculate a 99% confidence interval for the mean.

The population standard deviation is not known, so we have to estimate it from the sample standard deviation and use a t-students distribution to calculate the critical value.

When σ is not known, s divided by the square root of N is used as an estimate of σM:

$s_M=\dfrac{s}{\sqrt{N}}=\dfrac{6.89}{\sqrt{64}}=\dfrac{6.89}{8}=0.861$