(Choose 1 answer)
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.
A. 2.3 minutes
B. 3.3 minutes
C. 13.8 minutes
D. 6.9 minutes
E. None of the other choices is correct
