During business hours, the number of calls passing through a particular cellular relay system averages 5 per minute.

(a)

Find the probability that no call will pass through the relay system during a given minute.

(b)

Find the probability that no call will pass through the relay system during a given 2 minute period.

Not so sure about this one.

(c)

Find the probability that 3 calls will pass through the relay system during a given minute.

Correct?