**What is mean?**

Mean is the average of numbers.

**Example:**

3, 5, 6, 9, 8

**Mean **= all values/Total number of values

**Mean** = 3+5+6+9+8/5

**Mean** = 6.2

## How to calculate the mean for data with frequencies?

Age | Frequency | Age * Frequency |

22 | 5 | 22 * 5 = 110 |

33 | 2 | 33 * 2 = 66 |

44 | 6 | 44 * 6 = 264 |

66 | 4 | 66 * 4 = 264 |

Total | 17 | 605 |

**Mean** = 704/ 17

**Mean** = 41

**What is Median?**

Median is the middle value among all values.

**How to calculate median for an odd number of values?**

**Example:**

9, 8, 5, 6, 3

Arrange values in order

3, 5, 6, 8, 9

**Median **= 6

**How to calculate median for an even number of values?**

**Example:**

9, 8, 5, 6, 3, 4

Arrange values in order

3, 4, 5, 6, 8, 9

Add 2 middle values and calculate their mean.

**Median** = 5+6/2

**Median** = 5.5

**What is Mode?**

The mode is the most occurring value.

**How to calculate mode?**

**Example:**

3, 6, 6, 8, 9

**Mode **= 6 (because 6 is occurring 2 times and all other values occur only one time).