A website manager has noticed that during the evening hours, about 2.9 people per minute check out from their shopping cart and make an online purchase. She believes that each purchase is independent of the others and wants to model the time between purchases. Complete parts a through c.

a) What model would you use to model the time between events?

Binomial

Geometric

Exponential

Normal

b) What is the mean time between purchases?

The mean time between purchases is enter your response here minutes.

(Round to four decimal places as needed.)

c) What is the probability that the time to the next purchase will be between 1 and 2 minutes?

P(1X2)=enter your response here

(Round to four decimal places as needed.)