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Calculate deviation scores for each of the sample test grades listed below. What is the sum of the deviation scores? Note: Remember that you must

Calculate deviation scores for each of the sample test grades listed below. What is the sum of the deviation scores?Note: Remember that you must first calculate the mean.

Grade

100

78

89

92

55

90

80

65

88

95

_________________________________________________________________________________________

Using the grades listed in question above, 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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