ABSTRACT
Computation of the mean is easy: Sum (i.e., add up) the scores and divide by the number of scores. Here is an example:
Scores: 5, 6, 7, 10, 12, 15 Sum of scores: 55 Number of scores: 6 Computation of mean: 55/6 = 9.166 = 9.17
Notice in the example above that the answer was computed to three decimal places and rounded to two. In research reports, the mean is usually reported to two decimal places.
