Customers arrive at a garage at an average rate of 2 per five minute period. what is the probability that less than 15 arrive in a one hour period ? (a) 0.02619

Customers arrive at a garage at an average rate of 2 per five minute period. What is the probability that less than 15 arrive in a one hour period ? (A) 0.02619 (B) 0.0432 (C) 0.03211 (D) 0.2214