Above you will see what is called the "Bell Shaped Curve". It may look intimidating but it is really quite easy to understand once you take it one step at a time. The curve is divided into 8 sections which simply tell what percentage of the population scores in that given range. If your son or daughter are being tested by a school psychologist all tests will provide a "score" whether it be an IQ score or an achievement score. It is easiest to ask for the percentile of that "score" If you follow the percentile category up to the bell shaped curve you will be able to identify where your child falls in relationship to the rest of the population. It is highly important to notice the "0" or "50%" marker in the middle of the curve. 68.26 % of individuals tested will fall on either side of the "0" or "50%" mark.