The financial services call center in Problem 2.44 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. Construct a percentage histogram and a percentage polygon.

b. Construct a cumulative percentage polygon.

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

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