A.2 B.3 C.4 D.5
分析鐵礦中鐵的百分含量,得如下數(shù)據(jù): 37.45,37.20,37.50,37.30,37.25。計(jì)算該組數(shù)據(jù)的平均偏差和標(biāo)準(zhǔn)偏差()(67的平方根為25.88,5的平方根為2.236)。
A.0.14%和0.13% B.0.14%和0.12% C.0.11%和0.12% D.0.11%和0.13%
A.0.01000 B.0.06000 C.0.30000 D.0.36000