Fast Service Store has maintained daily sales records on the various size "Cool Drink" sales.

"Cool Drink" Price _______Number Sold

$0.50 ......................................... 75

$0.75 ........................................ 120

$1.00 ........................................ 125

$1.25 ......................................... 80

Total ........................................ 400

Assuming that past performance is a good indicator of future sales,

(a) What is the probability of a customer purchasing a $1.00 "Cool Drink?"

(b) What is the probability of a customer purchasing a $1.25 "Cool Drink?"

(c) What is the probability of a customer purchasing a "Cool Drink" that costs greater than or equal to $1.00?

(d) What is the expected value of a "Cool Drink"?

(e) What is the variance of a "Cool Drink"?