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You take random sample of 200 people from Salinas and find that their average income is $48, 000 per year with a standard deviation

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You take random sample of 200 people from Salinas and find that their average income is $48, 000 per year with a standard deviation of $9000. Also assume that population incomes are normally distributed. Approximately how many people make between $39, 000 and $57,000?

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