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30+35+39+36=140 mean= 140/4 therefore mean=35
The mean of 24, 34, 44, 31, 39, and 32 is 34.
9x+39
(1/7) x (15 + 39 + 30 + 10 + 8 + 39 + 27) = 168 / 7 = 24
If you mean 29, 39, 59 and 79 then it is 39 that is the only composite number.