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Using excel. Historically, a customer at CostCo spends $85 on average and the standard deviation is $30. If 500 customers shop in a given day,

Using excel.

Historically, a customer at CostCo spends $85 on average and the standard deviation is $30. If 500 customers shop in a given day, what is the probability that at least 30% of all customers spend at least $100. Show all the excel functions.

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