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27 May, 09:06

Suppose on a certain test, fifty students earn a perfect score and fifty students earn a zero. determine the mean grade and standard deviation among the one hundred students.

a. mean grade among the one hundred students is a0

b. standard deviation:

+1
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  1. 27 May, 09:31
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    A. Mean grade

    If a perfect score is 100

    mean = [50 * 100 + 50*0] / 100 = 50*100 / 50 = 50

    b. Standad deviation, SD

    SD = 50 * [√ (100 - 50) ^2] + 50 * [√ (0 - 50) ^2 ] = 50 * 50 + 50 * 50 = 5000
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