# Algebra

The mean amount of money withdrawn from a bank ATM on a particular day was \$120. If Lauren withdrew \$80 and her z-score was -3.2, what was the standard deviation for the amount withdrawn that day?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