The Average Wait Time at a McDonald's Drive-Through Window Is

question 108

Short Answer

The average wait time at a McDonald's drive-through window is about three minutes ("The Doctor Will See You Eventually," The Wall Street Journal, October 18, 2010). Suppose the wait time is exponentially distributed. What is the probability that a randomly selected customer will have to wait no more than five minutes?

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Definitions:

Quadriceps Femoris

A large muscle group that includes four muscles on the front of the thigh, responsible for knee extension and hip flexion.

Biceps Femoris

A muscle of the posterior thigh involved in knee flexion and hip extension, part of the hamstrings group.

Brachialis

A muscle in the upper arm that flexes the elbow, located beneath the biceps.

Ventrolateral surface

The surface of a body part or organ that is positioned toward the front and side.