A financial services call center monitors call duration, the amount of time spent speaking to customers on the phone. The file Call Duration contains the data for time, in seconds, agents spent talking to 50 customers:
a. Calculate the mean, median, and mode.
b. Calculate the range, variance, and standard deviation.
c. Based on the results of (a) and (b), what conclusions can you reach concerning the amount of time spent speaking to customers on the phone?