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An online pharmaceutical company obtained the following frequency distribution of

An online pharmaceutical company obtained the following frequency distribution of shipping times (number of hours between the time an order is placed and the time the order is shipped) for a random sample of 40 orders. (Be sure to complete all appropriate columns and show your work).

Number of Hours fi

4 < 10 ........... 8

10 < 16 ........... 15

16 < 22 ........... 10

22 < 28 ........... 7

a. What is the approximate mean shipping time?

b. What is the approximate variance and standard deviation?

Number of Hours fi

4 < 10 ........... 8

10 < 16 ........... 15

16 < 22 ........... 10

22 < 28 ........... 7

a. What is the approximate mean shipping time?

b. What is the approximate variance and standard deviation?

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