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?
Check this answer that was posted yesterday.
Ms.Sue, you are amazing.
You're the amazing one, Reiny. You posted the answer with the link yesterday. :-)
Yes, but you found it so quickly.
I was still looking for it.
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.
Thanks for the site. Is this the right formula:
P(-1 < z < 1) = 0.683