A.23 B.11 C.12 D.10 E.12.5
A.1:4 B.1:8 C.1:16 D.1:15 E.1:12
A.算術(shù)均數(shù) B.幾何均數(shù) C.百分位數(shù) D.中位數(shù) E.非同質(zhì)資料,求平均數(shù)沒(méi)有意義