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In the base 5 system, the first place is fives and the second place is twenty-fives. 10 in base 5 = 25 in base 10
The mean is also 10.
XXIX = 10 + 10 + (10-1) = 29
If you mean: 8 9 10 11 and 12 then the average mean is 10
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If you mean 1 to 10 then the equivalent ratio is 10 to 100If you mean: 1 to 10 then the equivalent ratio is 10 to 100