I assume your 4 numbers are 5,10,15 and 20. If you add them and divide by the amount of numbers, you get 5+10+15+20, which is 50, divided by 4 which is 12.5
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The arithmetic mean is an average arrived at by adding all the terms together and then dividing by the number of terms.
The mean
It is most likely to be the arithmetic mean.
The arithmetic mean is used in fields like statistics and economics. The arithmetic mean is the average of a group of numbers. It can be used to find test averages for students and in sports to find player averages
'cause they were average, not fantastic! It is sometimes stated that the 'mean' means average. This is incorrect if "mean" is taken in the specific sense of "arithmetic mean" as there are different types of averages: the mean, median, and mode. For instance, average house prices almost always use the median value for the average.