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The formula for Z-Score is: (x-mu)/sigma. We know from the information given that Z=0.5, mu=300 & sigma=100. Solve for x and plug in the values. X=Z*sigma+mu; x=0.5*100+300 or x=350. So, $350 is amount spent on books.

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Q: What amount spent on books has a standardized score equal to 0.5 if the mean amount spent was 300 and the standard deviation is 100?
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