Question 1

Outgoing calls at a call centre are completed in 130 seconds on average with a standard deviation of 8 seconds. Suppose call completion times are approximately normal. The shortest 2.5% of the completed calls will last less than how many seconds? Given Samples A and B below, Sample A: 3.2 3.2 2.4 2.7 4.1 2.4 4.5 4.9 4.7 Sample B: 4.1 2.5 2.9 2.6 4.4 3.9 4.9 3.1 2.8 a. Calculate the mean and standard deviation for each sample. Sample A: is. : 0.00 5 ;3A : 0.00 5 Sample B: :13 : 0.00 E ;$ : 0.00 5 Round to two decimalr places if necessary b. Calculate the coefficient of variation for each sample. Sample A: OVA : 0.00 % 5 Sample B: CVB : 0.00 % 3 Round to two decimal places if necessary c. Which sample is more variable? o Sample A O Sample B O Neither sample is more variable than the other =Number of items frequency Returned (f) (X) 2 4 3 6 4 9 5 7 6 3 Determine the mean, median, and mode