Homework Help: Math

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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