what behavioral studies, what are examples of normal distribution?>
A normal distribution is a bell-shaped frequency distribution curve. Most of the data values in a normal distribution tend to cluster around the mean. The further a data point is from the mean, the less likely it is to occur. There are many things, such as intelligence, height, and blood pressure, that naturally follow a normal distribution.
If there are many factors, none big, and no major correlations; maybe the distribution looks Normal for 99% or 99.9% of the observations. But never for 100%. With height, for example, there are outliers due to genetic conditions or stunting. In other cases, the problem is not outliers, but maximum or minimum values.