Suppose the time to deliver a pizza after an order for one is placed on a local restaurant’s Web site follows a uniform distribution with a minimum time of 4 minutes and a maximum time of 18 minutes.

a. Determine the probability that the next delivery will require less than 12 minutes.

b. Determine the probability that the next delivery will require between 6 and 10 minutes.

c. Determine the probability that the next delivery will require more than 7 minutes.

d. Determine the probability that the next delivery will require exactly 15 minutes.

e. Calculate the mean and standard deviation for this distribution.