The Time Between Customer Arrivals at a Furniture Store Has

Multiple Choice

The time between customer arrivals at a furniture store has an approximate exponential distribution with mean θ = 8.5 minutes. If a customer just arrived, find the probability that the next
Customer will not arrive for at least 20 minutes.

A) 0.346230
B) 0.904911
C) 0.653770
D) 0.095089