statistics

In a population of exam scores, a score of x=88 corresponds to z=+2.00 and a score of x=79 corresponds to z=-1.00. Find the mean and standard deviation for the population.

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asked by Tegan
  1. z/sigma = score - mean

    2 sigma = 88 - mean
    -sigma = 79 - mean

    subtract second equation from first.
    3 sigma = 9
    sigma = 3 is the standard deviation

    Use either equation to get the mean

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    posted by drwls

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