Posted by JJ on .
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,
Check this answer that was posted yesterday.
http://www.jiskha.com/display.cgi?id=1254361096 
WOW Math 
Reiny,
Ms.Sue, you are amazing.

Math 
Ms. Sue,
You're the amazing one, Reiny. You posted the answer with the link yesterday. :)

Math 
Reiny,
Yes, but you found it so quickly.
I was still looking for it. 
Math 
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.

Math 
JJ,
Thanks for the site. Is this the right formula:
P(1 < z < 1) = 0.683