According to a report by Scarborough Research, the average monthly household cellular phone

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According to a report by Scarborough Research, the average monthly household cellular phone bill is $60. Suppose local monthly household cell phone bills are normally distributed with a standard deviation of $11.35.

(a) What is the probability that a randomly selected monthly cell phone bill is more than $85?


(b) What is the probability that a randomly selected monthly cell phone bill is between $45 and $70?

(c) What is the probability that a randomly selected monthly cell phone bill is between $65 and $75?

 


(d) What is the probability that a randomly selected monthly cell phone bill is no more than $40?

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