甲、乙、丙、丁四位同学在三次数学测验中,他们成绩的平均分是=85,
=85,
=85,
=85,方差是
=3.8,
=2.3,
=6.2,
=5.2,则成绩最稳定的是( )
A.甲 | B.乙 | C.丙 | D.丁 |
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甲、乙、丙、丁四位同学在三次数学测验中,他们成绩的平均分是=85,
=85,
=85,
=85,方差是
=3.8,
=2.3,
=6.2,
=5.2,则成绩最稳定的是( )
A.甲 | B.乙 | C.丙 | D.丁 |