Statistics
posted by CJ on .
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?

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 
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?