Sara is a salesperson for Camera’s Etc. which is a ­retailer for high end digital cameras. Historically, Sara has averaged selling 2.1 extended warranties per day for cameras that she sells. Assume the number of camera warranties that Sara sells per day follows the Poisson distribution.

a. What is the probability that Sara will sell five extended warranties tomorrow?

b. What is the probability that Sara will not sell an ­extended warranty tomorrow?

c. What is the probability that Sara will sell more than two extended warranties tomorrow?

d. What is the standard deviation for this distribution?