The distribution of data can be displayed on a **Stem and Leaf Diagram**.

The Stem part is often the tens digit of each value.

The Leaf part is often the units digit of each value.

Ih this way we can easily see the distribution of our data.

**Example**

The marks gained by 15 students in a maths test are:

7, 9, 11, 14, 14, 17, 20, 22, 23, 25, 29, 30, 34, 37, 40

These can be represented on a Stem and Leaf Diagram as follows:

Stem |
Leaf |

0 | 7 9 |

1 | 1 4 4 7 |

2 | 0 2 3 5 9 |

3 | 0 4 7 |

4 | 0 |

This diagram makes it easier for us to see the following:

The** modal group** is 20-29 because this it the one with the highest frequency (most entries).

The **mode** or the **modal** **mark** is 14, because this is the value that occurs most often.

The **median** result is the 8th value (middle of 15), which is 22.

The **range** is 40 - 7 = 33.