Asked by JJ

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?
Answered by Ms. Sue
Check this answer that was posted yesterday.

http://www.jiskha.com/display.cgi?id=1254361096


Answered by Reiny
Ms.Sue, you are amazing.
Answered by Ms. Sue
You're the amazing one, Reiny. You posted the answer with the link yesterday. :-)

Answered by Reiny
Yes, but you found it so quickly.
I was still looking for it.
Answered by Ms. Sue
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.



Answered by JJ
Thanks for the site. Is this the right formula:
P(-1 < z < 1) = 0.683
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