Phone Orders
the L $\lambda$ ,The Parameter of the Exponential Distribution in This Situation

Essay

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 is the value of $\lambda$ ,the parameter of the exponential distribution in this situation?