Arithmetic Mean in the most common and easily understood measure of central tendency. We can define mean as the value obtained by dividing the sum of measurements with the number of measurements contained in the data set and is denoted by the symbol x¯x¯.

We’re going to discuss methods to compute the **Arithmetic Mean** for three types of series:

· Individual Data Series

· Discrete Data Series

· Continuous Data Series

__Individual Data Series__

__Individual Data Series__

When data is given on individual basis. Following is an example of individual series:

Items | 5 | 10 | 20 | 30 | 40 | 50 | 60 | 70 |

__Discrete Data Series__

__Discrete Data Series__

When data is given alongwith their frequencies. Following is an example of discrete series:

Items | 5 | 10 | 20 | 30 | 40 | 50 | 60 | 70 |

Frequency | 2 | 5 | 1 | 3 | 12 | 0 | 5 | 7 |

__Continuous Data Series__

__Continuous Data Series__

When data is given based on ranges alongwith their frequencies. Following is an example of continous series:

Items | 0-5 | 5-10 | 10-20 | 20-30 | 30-40 |

Frequency | 2 | 5 | 1 | 3 | 12 |