Recall that Table 1.9 presents the waiting times for teller service during peak business hours of 100 randomly selected bank customers. Eigures 3.9 and 312 give the MINITAB and Excel outputs of statistics describing the 100 walting times. Click here for the Excel Data File (a-1) Find the sample mean on the outputs. (Round your answer to 2 decimal places.) Mean (a-2) Does the sample mean provide some evidence that the mean of the population of all possible customer waiting times during peak business hours is less than six minutes (as is desired by the bank manager)? because FIGURE 3.12 Excel Output of Walting Time Statistics (for Exercise 3.6) Wait Time Mean Standard Error Median Mode Standard Deviation Sample Variance Kurtosis Skewness Range Minimum Maximum Sum Count 5.46 0.2475 5.25 5.8 2.4755 6.1279 -0.4050 0.2504 11.2 0.4 11.6 546 100