Phone Orders the L.L.Bean Catalog Department That Receives the Majority of Majority

question 91

Short Answer

Phone Orders
The L.L.Bean catalog department 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.
-{Phone Orders Narrative} What proportion of customers having to hold more than 1.5 minutes will hang up before placing an order?