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