The owner of a movie rental shop decided to try sending DVDs through the mail. I

Question

The owner of a movie rental shop decided to try sending DVDs through the mail. In order to determine how many copies of newly released titles he should purchase, he carefully observed turnaround times. Since nearly all of of his customers were in his local community, he tested delivery times by sending DVDs to his friends. He found the mean delivery time was 1.7 days, with a standard deviation of 0.5 days. He also noted that the times were the same whether going to the customer or coming back to the shop. Complete parts a and b below. a) Find the mean and standard deviation of the round-trip delivery times for a DVD (mailed to the customer and then mailed back to the shop The mean round-trip delivery time would be day(s). (Type an integer or a decimal.)

Explanation / Answer

The mean = 1.7 + 1.7 = 3.4

The standard deviation = Ö [0.5^2 +0.5^2] = 0.7071

Answer:

The mean round-trip delivery time would be 3.4 days.

The standard deviation of round-trip delivery time would be 0.7071 days.

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