Question

The service-time distribution describes the probability P that the service time of the customer will be no more than t hours. If m is the mean number of customers serviced in an hour, then 649-06-04-00-00_files/i0140000.jpg.

Suppose a computer technical support representative can answer calls from 6 customers in an hour. What is the probability that a customer will be on hold less than 30 minutes?
a.
65%
c.
85%
b.
75%
d.
95%