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application statistic

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assume that a set of test score is normally distrubuted with a meanof 100 and a standard deviation of 20 find the quantities using the 68-95-99.7 rule to get:
the percentage of scores less than 100:
B) relative frequency of scores less than 120 c) percentage ofless than 140, D)percentage of less than 80, relative frequency of score less than 60,F) pertenage of scores greater than 120?

  • application statistic - ,

    A. In normal distribution, mean = median

    Z = (score - mean)/SD

    B. Z = +1, p = mean + 1/2 (68)

    Use similar process for the remainder of the questions.

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