Posted by JJ on Thursday, October 1, 2009 at 9:24pm.
Suppose scores on an IQ test are normally distributed. If the test has a mean of 100 and a standard deviation of 10, what is the probability that a person who takes the test will score between 90 and 110?

Math  Ms. Sue, Thursday, October 1, 2009 at 9:30pm
Check this answer that was posted yesterday.
http://www.jiskha.com/display.cgi?id=1254361096

WOW Math  Reiny, Thursday, October 1, 2009 at 9:32pm
Ms.Sue, you are amazing.

Math  Ms. Sue, Thursday, October 1, 2009 at 9:34pm
You're the amazing one, Reiny. You posted the answer with the link yesterday. :)

Math  Reiny, Thursday, October 1, 2009 at 9:36pm
Yes, but you found it so quickly.
I was still looking for it.

Math  Ms. Sue, Thursday, October 1, 2009 at 9:48pm
Ahh  I'll let you in on a little secret. <g> I entered IQ test in the little Search box in the upper right corner of the Jiskha screen. Boom! Your post popped right up.

Math  JJ, Thursday, October 1, 2009 at 10:16pm
Thanks for the site. Is this the right formula:
P(1 < z < 1) = 0.683
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