Question

At a telephone enquiry system the number of phone calls regarding relevant enquiry follow Poisson  distribution with a average of 5 phone calls during 10-minute time intervals. The probability that there is at the most one phone call during a 10-minute time period is

(a)6/5^e 

(b)5/6

(c)6/55

(d) 6/e⁵
.

Answer 1

(d) : We know that poission distribution is given by