The mean shoe size of the students in a math class is 7.5. Most of the shoe sizes fall within 1 standard deviation, or between a size 6 and a size 9. What is the standard deviation of the shoe size data for the math class? A.1.5 B.2.7 C.3.0 D.3.8

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The formula of standard deviation is  SD = square root of (variance) Variance is the average of the squared differences from the Mean. Variance = (6-7.5)^2 + (9-7.5)^2 / 2 Variance = 2.25 SD = square root (2.25) SD = 1.5 The correct answer is A. 1.5

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