Posted by CJ on Wednesday, April 28, 2010 at 8:39am.
The mean IQ among members of a club is 118 with a standard deviation of 9.46. What percentage of the members had IQ scores of 115 or higher?

Statistics  Reiny, Wednesday, April 28, 2010 at 8:43am
try this applet instead of looking up your zscores in a table or chart, you will love it
You can enter the zscores , or the data as it stands
http://davidmlane.com/hyperstat/z_table.html

Statistics  CJ, Wednesday, April 28, 2010 at 2:13pm
The applet is great! But I wonder, given the information I have, can I assume that the distribution is normal? (The mean IQ among members of a club is 118 with a standard deviation of 9.46. What percentage of the members had IQ scores of 115 or higher?) If it isn't normal  I can't determine the percentage ... or can I?
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