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The arithmetic mean is 140. The geometric mean is approx 138.56 and the harmonic mean is approx 137.14
30+35+39+36=140 mean= 140/4 therefore mean=35
CXL = 140
sample size, n = 140standard deviation, s = 11.45standard error of the mean, SE = s / n^1/2 = 11.45 / 140^1.2 = 0.967795% confidence interval => mean +- 1.96SE95% CI = 86.5 - 1.96*0.9677; 86.5 + 1.96*0.9677= 84.6; 88.4
It doesnt mean much but it means you are smart