The Florida Credit Bank is concerned about the quality of service provided to its customers. With the old computer system, a teller at this bank could serve, on the average, 18 customers per hour. Management recently installed a new computer system in the bank expecting that it would increase the service rate. To check if the new computer system is more efficient than the old system, the management of the bank took a random sample of 20 hours and found that during these hours the mean number of customers served by tellers was 25 per hour with a standard deviation of 2.5. Use a 1% level of significance. The hypothesis is that the average number of customers served per hour is 24 or less against the alternative hypothesis that the mean number of customers waiting is greater than 24.