The financial services call center in Problem 3.66 also monitors call duration, which is the amount of time spent speaking to customers on the phone. The file CallDuration contains the following data for time, in seconds, spent by agents talking to 50 customers:

a. Compute the mean, median, range, and standard deviation for the call duration, which is the amount of time spent speaking to customers on the phone. Interpret these measures of central tendency and variability.

b. List the five-number summary.

c. Construct a boxplot and describe its shape.

d. What can you conclude about call center performance if a call duration target of less than 240 seconds is set?

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