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According to Cellular Telecommunications industry Association, the average local monthly cell phone bill is $42.78. Suppose local monthly cell phone bills are normally distributed, with a standard deviation of $11.35.

a) What is the probability that a randomly selected cell phone bill is more than $67.75?
b) What is the probability that a randomly selected cell phone bill is no more than $25?

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
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