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Suppose that the annual income of a fast-food chain is normally distributed with a mean of $72,000 and a standard deviation of $9,000. b) What

Suppose that the annual income of a fast-food chain is normally distributed with a mean of $72,000 and a standard deviation of $9,000.

b) What is the probability that a randomly selected fast-food restaurant will generate an annual profit of more than $80,000 ? Explain the answer step by step using formula only & don't use excel.

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