important role in managing day. Call centers today play an can answered 15 12 6 19 16 16 15 13 25 9 17 12 10 23 11 12 14 24 9 10 13 14 26 19 20 13 24 a 5 15 15 21 8 16 12 a. Calculate the mean, median, range, and standard deviation for the speed of answer, which is the time to answer incoming calls. b. List the five-number summary. c. Construct a boxplot and describe its shape. d. What can you conclude about call center performance if the service level target is set as "75% of calls answered in under 20 seconds?"