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sum = 138 sample size = 7 138 / 7 ~= 19.714285714285715
mean(18, 23, 39, 10, 22, 17, 16, 15) = (18 + 23 + 39 + 10 + 22 + 17 + 16 + 15) ÷ 8 = 160 ÷ 8 = 20
mean = the sum of the observed values / number of observations = 23+12+15+25+10 / 5 =85/5 =17
The mean is 23.
2.3 = 23/10 and reduces to: 2 3/10