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// this is incorrect Variance = [(12.5)^2+(22.5)^2+(32.5)^2+(42.5)^2]/(41)
Variance = [(12.5)^2+(22.5)^2+(32.5)^2+(42.5)^2]/4 because the population is known mean is known.
Therefore, variance = 5/4 as Swissaholic pointed out. |
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发表于 2013-4-12 22:50
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