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.

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**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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