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Problems basaed on distribution phone bills

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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?

Reference no: EM13800700

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