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In a sample of 50 transactions for a pet store, it is found that on average the purchase total was $76.80 with a standard deviation

In a sample of 50 transactions for a pet store, it is found that on average the purchase total was $76.80 with a standard deviation of $14.20.

What is the sample size required to give a margin of error of at most $3.25 for a 99% confidence interval? Answer as a whole number.

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