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Statement of a problem № m1402

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According to a report by Scarborough Research, the average monthly household cellular phone bill is $73. 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 $100? b. What is the probability that a randomly selected monthly cell phone bill is between $60 and $83? c. What is the probability that a randomly selected monthly cell phone bill is between $80 and $90? d. What is the probability that a randomly selected monthly cell phone bill is no more than $55? 




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