A.S B. C.全距 D.CV E.自由度
A.4 B.5.5 C.7 D.12 E.9.5
A.算術(shù)均數(shù) B.幾何均數(shù) C.中位數(shù) D.加權(quán)均數(shù) E.百分位數(shù)