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15x=5 x=1/3 則數據為1/3,2/3,1,4/3,5/3 方差=(1/3 -1)^2 +(2/3 -1)^2 +(1 -1)^2 +(4/3 -1)^2 +(5/3 -1)^2 =10/9
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