23*5 = 115
So pick any four numbers: integers, fractions, irrational numbers, whatever.
Add them together to give a sum S.
Let the 5th number be 115 - S
Then:
sum of all five numbers = (sum of the first four numbers) + (the fifth number)
= S + (115 - S) = 115
And the count of numbers = 5
So mean = Sum/Count = 115/5 = 23
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Since there are five numbers in that group, the mean (average) of the group is 1/5 of their sum.
The first five prime numbers are 2, 3, 5, 7, and 11. I don't know what you mean by "of 28".
The first five two-digit prime numbers are 11, 13, 17, 19, and 23.
Here is a set of 5:24.9999999999999999999999999999999999124.99999999999999999999999999999999991000000224.999999999999999999999999999999999910000002424.999999999999999999999999999999999910000724.999999999999999999999999999999999910083.
To calculate the mean you add all of the numbers together, and then divide by how many numbers were added. In this case, the mean is 21.