Domino’s Pizza receives majority of its orders by telephone. The call center supervisor conducted a study on the duration an order had been taken. He found that the amount of time a customer was waiting to place an order was about 10 minutes. Assume that the distribution of time spent in taking orders is approximately exponentially distributed with a mean of 5 minutes. The supervisor is considering adding extra telephone order services to decrease the customers’ waiting time. Help the supervisor determine the probability that a second telephone order is coming before the first order has ended. Justify whether the extra telephone order service is necessary.