is defined as the measure that represents an arithmetic average
of a set of numbers. Mean is derived by dividing the sum of a group
of numerical items by the total number of items in that group. For example, mean family
income is obtained by dividing the total of all income reported by people 15 years and over in families by the total number of families.
Moreover, Mean is a measure of central tendency
obtained by summing the individual scores and dividing the sum by the number of scores.
Other /More definition:
The term Mean describes the average of a group of scores.