
Poisson Probability
The average number of calls received by a switchboard in a 30minute period is 15
a. What is the probability that between 10:00 and 10:30 the switchboard will receive exactly 10 calls?
b. What is the probability that between 10:00 and 10:30 the switchboard will receive more than 9 calls but fewer than 15 calls?
c What is the probabilitythat between 10:00 and 10:30 the switchboard will receive fewer than 7 calls?
Not really Sure how to set up.

The Poisson Probability Distribution is very straightforward. Simply calculate the desired values.
As long as we are sticking witht he halfhour period already defined, just go with it. No adjustment is required.
You do the last one.