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Using the grades listed in question ( 100, 85, 77, 63, 94, 90, 71, 82, 69, 54) , calculate the range, variance, and standard deviation

Using the grades listed in question ( 100, 85, 77, 63, 94, 90, 71, 82, 69, 54) , calculate the range, variance, and standard deviation of the grade distribution. Briefly explain why it is important to square deviation scores in calculating the variance and standard deviation.

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