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Help ! With explanation if possible. This stuff turns my brain into knots. The distribution of the amount of money spent by students on textbooks

Help ! With explanation if possible. This stuff turns my brain into knots.

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The distribution of the amount of money spent by students on textbooks in a semester is approximately normal in shape with a mean of 380 and a standard deviation of 23. According to the standard deviation rule, approximately 95% of the students spent between $ and $ on textbooks in a semester

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