According to Collegeboard.com [www.college- board.com/] the national average salary for a plumber as of 2007 is $47,350.

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According to Collegeboard.com [www.college- board.com/] the national average salary for a plumber as of 2007 is $47,350. If we assume that the annual salaries for plumbers are normally distributed with a standard deviation of $5250, find the following:
a. What percentage earn below $30,000?
b. What percentage earn above $63,000?
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Elementary Statistics

ISBN: 9780538733502

11th Edition

Authors: Robert R. Johnson, Patricia J. Kuby

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