The grades on a short quiz in biology were 0 i 2 10, Ask an Expert

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The grades on a short quiz in biology were 0, I , 2, . . . , 10 points. depending on the number answered correctly out of I O questions. The mean grade was 6.7 and the standard deviation was.

Assuming the grades to be normally distributed. determine (a)the percentage of students scoring 6 points, (h)the maximum grade of the lowest 10% of the class. and (c) the minimum grade of the highest I 0% of the class.

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