Benny the barber owns a one-chair shop. at barber college, they told benny that his customers would exhibit a poisson arrival distribution and that he would provide an exponential service distribution. his market survey data indicate that customers arrive at a rate of two per hour. it will take benny an average of 20 minutes to give a haircut. based on these figures. a. what is the average number of customers waiting? (round your answer to 4 decimal places.)average number of customers waiting b. what is the average time a customer waits? (round your answer to nearest whole number.) average time a customer waitsminutes c. what is the average time a customer is in the shop? average time a customer minutes d. what is the average utilization of benny's time? (round your answer to the nearest whole percent.) average utilization %