Less Than
2009
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Less Than
What proportion of the population is less than 17?
A normal population has a mean of 19 and a standard deviation of 5 what proportion of the population is less than 17?
1. This is a simple statistics problem. Even you don't understand how to do it, you should be asking in the Math section of Yahoo Answers, not the Economics section
2. If the mean is 19 and the standard deviation is 5, then 17 is (19-17)/5 or 0.4 standard deviations below the mean.
http://en.wikipedia.org/wiki/Normal_distribution#Standard_deviation_and_confidence_intervals
3. If you don't already have a statistics calculator, there are many on-line:
http://stattrek.com/Tables/Normal.aspx
http://www.danielsoper.com/statcalc/calc53.aspx
http://www.easycalculation.com/statistics/normal-distribution.php
http://socr.ucla.edu/htmls/SOCR_Distributions.html
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