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Problem 1 The time it takes to process phone orders in a gift shop is normally...

Problem 1 The time it takes to process phone orders in a gift shop is normally distributed with a mean of 6 minutes and a variance of 4 minutes.

a. what is the probability that a phone order can be processed by at least 5 minutes

b. what is the probability that a phone order can be processed by at most 4 minutes

c. What cutoff value would separate the 10% of orders that take the most time to process?

d. if we take a sample of 4 processed phone orders, what is the probability that the average time taken to process phone calls is more than 7.5 minutes

e. if we take a sample of 4 processed phone orders, what is the probability that the average time taken to process phone calls is between 4.5 and 8.5 minutes

Math   Statistics-And-Probability   
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