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The mean amount of money withdrawn from a bank ATM on a particular day was $120. If Lauren withdrew $80 and her z-score was -3.2, what was the standard deviation for the amount withdrawn that day?

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  1. z-score = (given data - mean)/ sd
    -3.2 = (80-120)/sd
    -3.2sd = -40
    sd = 12.5

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