Suppose the average waiting time for a customer's call to be answered by a company representative (modeled by exponentially decreasing probability density functions) is 20 minutes. Find the median waiting time.
a. 13.86 minutes
b. 17.86 minutes
c. 15.86 minutes
d. 16.86 minutes
e. 14.86 minutes
a. 13.86 minutes
Mathematics
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A. 
B. 
C. 
D. 
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