81/10 or 8.1
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1 tenth
Twenty-one tenths, which is 2 and one tenth or 2.1 in decimal.
1 and 9/10 + 1/10 = 2
The first decile (D1) is a number such that one tenth of the observations are smaller and nine tenths are larger. The ninth decile (D9) is a number such that nine tenths of the observations are smaller and one tenth are larger. The interdecile range is D9 - D1
There are nine tenths in 0.9. This is because 0.9 can be expressed as 9/10, meaning it consists of nine parts out of ten. Each tenth represents one part of the whole, so 0.9 contains nine of those tenths.