AP PSYCHOLOGY

Detailed explanation-1: -A normal distribution curve, when graphed out, typically follows a bell-shaped curve, hence the name. While the precise shape can vary according to the distribution of the population, the peak is always in the middle and the curve is always symmetrical.

Detailed explanation-2: -Bell Curve: When IQ scores are plotted on a graph, they typically follow a bell-shaped curve.1 The peak of the “bell” occurs where the majority of the scores lie. The bell then slopes down to each side; one side represents lower than average scores and the other side represents scores that are above the average.

Detailed explanation-3: -The normal distribution is often called the bell curve because the graph of its probability density looks like a bell. It is also known as called Gaussian distribution, after the German mathematician Carl Gauss who first described it.