A team of consultants studied the service operation at the Wendy's Restaurant in the Woodbridge Mall in Woodbridge, New Jersey. They measured the time between customer arrivals to the restaurant over the course of a day and used those data to develop a probability distribution to characterize x, the number of customer arrivals per 15-minute period. The distribution is shown in thk table at the top of this page.

a. Does this distribution meet the two requirements for the probability distribution of a discrete random variable? Justify your answer.
h. What is the probability that exactly 16 customers enter the restaurant in the next 15 minutes?

c. Find p(x 5 10).

d. Find p(5 5 x 5 15).