Airline passenger arrive randomly and independently at the passenger screening facility at a major international...

Airline passenger arrive randomly and independently at the passenger screening facility at a major international airport with mean arrival rate of 10 passenger per minute. 1. what is the probability that exactly 7 passengers arrive in a minute period? 2.what is the probability that at the most 5 passengers would in a minute period? 3.what is the probability that number of passenger in a minute would be between 8 and 12 both inclusive?