In summary, we calculate the mean by simply adding all the numbers given and then divide the sum obtained by the total number of values that were added together.
For example, let's say you have four test scores: 15, 18, 22, and 20. To find the average, you would first add all four scores together, then divide the sum by four. The resulting mean is 18.75. Written out, it looks something like this:
- (15 + 18 + 22 + 20) / 4 = 75 / 4 = 18.75
If you were to round up to the nearest whole number, the average would be 19.