## Overview

When there is many elements in a dataset, it would be useful to have a measure that best represents the dataset. Such a measure would be the central element in within the data data-set. When the data has a normal distribution this central tendency could be best described by the average. In statistics the more formal term for average is mean (`).`

The mean is the sum of all the data elements (*x _{1}…x_{n}*) divided by the count (

*n*). This can be mathematically represented as follows:

Where,

first element

last element

count

Example 1.

The weight (kg) of children in a small class is as follows: 17.1, 15.4, 13.5, 18.7,19.4. What is the average weight of the children in the class?

Answer.

The cunt (*n*)

The sum of the weights:

The mean: