若一組數(shù)據(jù)的方差S²=n分之1(x1²+x2²+……xn²),那么這組數(shù)據(jù)的平均數(shù)是?
若一組數(shù)據(jù)的方差S²=n分之1(x1²+x2²+……xn²),那么這組數(shù)據(jù)的平均數(shù)是?
數(shù)學人氣:622 ℃時間:2019-09-27 14:06:48
優(yōu)質(zhì)解答
這位朋友,在問之前不妨看看書,了解方差的公式結(jié)構(gòu):S²=1/n[(x1-平均數(shù))²+(x2-平均數(shù))²+……+(xn-平均數(shù))²],即每個數(shù)據(jù)減去這一組數(shù)據(jù)的平均數(shù)的差的平方,再取平均數(shù),把你提交的式子與方差公...
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