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On a Recent English Exam,scores Averaged 84 Points

Question 65

Multiple Choice

On a recent English exam,scores averaged 84 points.If 41% of scores fell below 70 points,find an approximate standard deviation (assuming the Normal model is appropriate) .


A) 60.87
B) -69.57
C) -669.57
D) 34.44
E) 28.7

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