# 6.1 Bell Curves

### By Susan, Bennett, and John

## Properties of A Bell Curve

It is Bell-shaped, with highest point over the mean.

It is symmetrical with a vertical line going through the mean.

The curve approaches the horizontal axis but never touches or crosses it.

Transition points occur between upward and downward cups, about negative and positive means.

It is symmetrical with a vertical line going through the mean.

The curve approaches the horizontal axis but never touches or crosses it.

Transition points occur between upward and downward cups, about negative and positive means.

## Examples

## How to find the Mean and Standard Deviation on A Curve

## Rule Continued

Going further into the curve,

34% will lie between negative and positive 1 standard deviation.

13.5% will lie between negative and positive 2 standard deviation.

2.35% will lie between negative and positive 2 and 3 standard deviation.

0.15% will lie between negative and positive 3 standard deviation.

34% will lie between negative and positive 1 standard deviation.

13.5% will lie between negative and positive 2 standard deviation.

2.35% will lie between negative and positive 2 and 3 standard deviation.

0.15% will lie between negative and positive 3 standard deviation.