The answer shown on the problem is not correct. Need help on how to get to the right answer. Thanks
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Recent GMAT Questions from the GMATprep CD.
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GmatMathPro
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Standard deviation is 0.3, so 1.5 standard deviations would be 0.3*1.5=0.45, so we want all data points that are between the 8.1+-0.45. That is, between 7.65 and 8.55. Only 7.51 is outside of this range, so 11 is the answer.
