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Assume that the distribution of the prices of sold TV sets is normal. In store A, the monthly sales of TV sets had a

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Assume that the distribution of the prices of sold TV sets is normal. In store A, the monthly sales of TV sets had a mean price of $520 with a standard deviation of $20. In store B, the mean price was $510 with a standard deviation of $18. In which store was a price of $580 higher in relation to all the sales in that store?

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