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# Movies: Estimating Mean and Standard Deviation Consider

ISBN: 9780321836960 18

## Solution for problem 6RE Chapter 3.4

Elementary Statistics | 12th Edition

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Problem 6RE

Movies: Estimating Mean and Standard Deviation Consider the prices of regular movie tickets (not 3-D, and not discounted for children or seniors). The prices of movie tickets are \$15, \$20, \$22. \$24 and \$25.

a. Estimate the mean price.

b. Use the range rule of thumb to make a rough estimate of the standard deviation of the prices.

Step-by-Step Solution:

Step 1 of 1 :

a).

Consider the prices of regular movie tickets are

\$15,\$20,\$22,\$24,and \$25

Now we have to estimate Mean and Standard Deviation

Find the mean (the average) of the data set:

=

Mean =

Mean =

Mean =

Mean = 21.2

The answers may vary but a mean around \$8 or \$9 is reasonable.

b).

A reasonable standard deviation would be around \$1 or \$2.

Calculate the deviation from the mean by subtracting each value from the mean.

Then the formula of the standard deviation is

SD=

Step 2 of 3

Step 3 of 3

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