During 0200pm to 0400pm, the average number of phone calls per minute coming into the switch board of a company is 2.5 calls. Find the probability that:

A. At least 5 incoming calls in 120 seconds.

B. At most 4 incoming calls in 100 seconds.

C. Less than 6 calls in 125 seconds.

D. More than 8 calls in 200 seconds.

E. 2, 3 or 4 calls in 90 seconds.

F. 3 to 5 calls in 130 seconds.