A new-word processing unit is fully warranted during its first year. The number of warranty service call X for a unit during its first year is Poisson-distributed with = 1.2.

a) What is the probability of exactly 1.20 service calls during the first year?

b) Find the probability of at least 1 calls in the first year.

c) Find the probability of no service calls during the first 3 months.