Q6. The average number of calls received by a switchboard in a 30-minute period is 13(use table).

a.

What is the probability that between 10:00 and 10:10 the switchboard will receive exactly 10 calls?

b.

What is the probability that between 10:00 and 10:15 the switchboard will receive more than 10 calls but fewer than 15 calls?

c. What is the probability that between 10:00 and 10:30 the switchboard will receive fewer than

7 calls?