A.算術(shù)平均值B.變異系數(shù)C.幾何平均數(shù)D.中位數(shù)
A.7~10B.3~5C.9~12D.12~17
A.雞的產(chǎn)蛋數(shù)B.初生犢牛的性別C.雞的毛色D.生豬的價格