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?

Answer 1

Check this answer that was posted yesterday.

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

Answer 2

Ms.Sue, you are amazing.

Answer 3

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

Answer 4

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

Answer 5

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.

Answer 6

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