Use the formula:se = (s/√n) x √(N-n/N-1)se = 15/√59.5 x (√(140-56)/139)se = 1.512
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Hey Grant, I'm just the answer Nazi. You divided by the mean (59.5), not the sample population (56) to find the sample error, so your answer is slightly off. I think it should be se= 15/√56(√[(140-56)/139) = 1.558 I think...correct me if I am wrong