Mean

The mean of a set of numbers, x₁, x₂,.x_n is defined to be (x₁ + x₂...+ x_n) ÷ 4n. Thus the mean of 2, 3, 7, and 5 is (2 + 3 + 7 + 5) ÷ 4 = 17 ÷ 4.

The mean is also known as the average. It is one of the measures of central tendency, the others being the mode and median.