A.5cm B.1.96cm C.2.58cm D.3.2cm E.4.5cm
A.128c B.123cm C.121cm D.127cm E.126cm
A.算術(shù)均數(shù) B.幾何均數(shù) C.中位數(shù) D.眾數(shù) E.標準誤