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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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