a. Bank branch located in a commercial district of a city has developed and improved process for serving customer during peak lunching period. The waiting time (in minute) of all customers during this period is recorded over a week. A sample of test customers is selected and the results are as follows: A. 5.55 3.02 5.13 4.77 2.34 3.54 3.20 4.50 0.38 i. Calculate the mean and standard deviation of customer waiting time. (4 marks) ii. Determine degree of freedom, type of test and critical value at 5% level of significance. (3 marks) iii. Is the evidence to support that average waiting time is less than 5 minutes. (5 marks) 5