statistics
posted by ROXIE .
CALCULATE THE PERCENTAGE OF CASES THAT FALL BETWEEN THE SCORES 120 AND 110 ON A NORMALLY DISTRIBUTED iq TEST WITH A MEAN OF 100 AND A STANDARD DEVIATION OF 10

First, please do not use all capitals. Online it is like SHOUTING. Not only is it rude, but it is harder to understand. Thank you.
Z = (scoremean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions related to the Z scores.