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(Choose 1 answer)
☐ A
A. None of the other choices is correct
☐ C
B. 13.8 minutes
C. 2.3 minutes
☐ E
D. 3.3 minutes
E. 6.9 minutes
A catalog company that receives the majority of its orders by telephone conducted a study to determine how
long customers were willing to wait on hold before ordering a product. The length of time was found to be a
random variable best approximated by an exponential distribution with a mean equal to 3 minutes. Find the
waiting time at which only 10% of the customers will continue to hold.
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