You need an average because it helps you compare your results.It helps you be more accurate and have more precision.
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If I have 28 employees and need to get the average for a year, how do I do that?
You don't need to. Average deviation (about the mean) is always zero!
You can get the average of an average, but you would be averaging one number, so you would get the same result. You can get the average of a set of averages, though to make sense they will often need to be a weighted average of averages.
You need more than one number to get a proper average. The average of one number itself. So the average of 80.5 would be 80.5 and so 3.0 could not be the average.
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