Homework Help: math

Posted by Jen on Thursday, October 25, 2012 at 10:35pm.

Assume that the average annual salary for a worker in the United States is $30,500 and that the annual salaries for Americans are normally distributed with a standard deviation equal to $6,250. Find the following:
(A) What percentage of Americans earn below $19,000?
(B) What percentage of Americans earn above $40,000?

math - PsyDAG, Saturday, October 27, 2012 at 12:15am
Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/percentages related to the Z scores.

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