The arithmetic mean is the result of adding all numbers in a series, counting the number of numbers in the series, and then dividing the sum by the count.

In this KS2 Maths article you'll learn how to calculate a type of average called the mean. We also have KS2 videos, a quiz and lots of examples.

The table above (click to enlarge) shows mean test scores and standard deviations for the SAT exam on the three different sections (reading, math and writing), broken down by gender (data ...