The management of the large department store in Example B.1 must determine whether more training is needed for the customer service clerk. The clerk at the customer service desk can serve an average of three customers per hour. What is the probability that a customer will require 10 minutes or less of service?SOLUTIONWe must have all the data in the same time units. Because m = 3 customers per hour, we convert minutes of time to hours, or T = 10 minutes = 10>60 hour = 0.167 hour. Then DE CISION POINTThe probability that the customer will require only 10 minutes or less is not high, which leaves the possibility that customers may experience lengthy delays. Management should consider additional training for the clerk so as to reduce the time it takes to process a customer request.