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The variance of 14 14 20 38 47 48 57 = 317.6667
40 + 57 + 40 + 30 + 47 + 31 + 60 + 38 + 64 + 30 + 120 = 557
It is: (32*48) -57 = 1479
32/57 = 0.561 (approx).
57 is the only composite number is the list.