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Tammy would like to research the average amount of money that people hold in their wallet or purse? Tammy estimates that people hold somewhere between

Tammy would like to research the average amount of money that people hold in their wallet or purse? Tammy estimates that people hold somewhere between $0 and $1,000 and would like her final estimation to be within $5 of the actual value. With a desired level of confidence of 90%, what size of a sample should she take?

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