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 (x1…xn) divided by the count (n). This can be mathematically represented as follows:
Where,
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:
