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March 28, 2017

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Assume that the salaries of elementary school teachers in the U.S. are normally distributed with a mean of $37,000 and standard deviation of $3500. The cutoff salary for teachers in the bottom 12% is

  • help - ,

    Working this kind of problem will require tables or some other form of "lookup".

    Here is the perfect method to replace good ol' tables in back of textbooks

    http://davidmlane.com/hyperstat/z_table.html

    click on "value from area"
    enter .12 in "area"
    enter 37000 in "mean"
    enter 3500 in SD
    click on "below" and

    lo and behold ----- cutoff salary is $32887

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