so we know that are , so for:
a)
b)
c)
1, In a particular departmental store customers arrive at a check up counter
according to poisson distribution at an average of 5 per hour
During a particular 1 hour period,
a,what is the probability that at least 3 customers will arrive
b,What is the probability that in a given 2 hours period exactly 2 customers will arrive
c,In a 30 minute period determine the probability that at most 2 customers will arrive