Answer (Choose 1 answer)
A. 0.22313
B. 0.77687
C. 0.51342
D. None of the other choices is correct
Ε. 0.48658
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. What proportion of customers having to hold more than 4.5 minutes will hang up before placing an order?
