# Making Deviation Standard

### Resources for this lesson:

> Glossary

> Calculator Resources

> Teacher Resources: Instructional Notes

## Real-Life Scenarios

> Text version for animation

Calculating standard deviation is similar to calculating mean absolute deviation. For simplicity, let’s use the first five presidents and the length of their terms in years.

President |
Number of Years Served |
---|---|

1. G. Washington | 6.34 |

2. J. Adams |
4 |

3. T. Jefferson |
8 |

4. J. Madison |
8 |

5. J. Monroe |
8 |

## Check Your Understanding

The next step in calculating standard deviation is to subtract each data point from the mean and add the differences together, just as you did for mean absolute deviation. However, instead of taking the absolute value of the differences, you *square the differences*.

## Check Your Understanding

Now, follow the next steps to calculate the standard deviation for the first five presidential terms.

## Check Your Understanding