The computation shows the mean of the numbers given will be 20.
Your information isn't well written. Therefore, an overview will given. A mean simply means the average of a set of numbers.
Let's assume that the given numbers are 10, 20, 30, 25 and 15. The mean will be:
= (10 + 20 + 30 + 25 + 15) / 5
= 100/5
= 20
Therefore, the mean is 20.
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