(2013•南平)甲、乙、丙、丁四位同学在5次数学测验中,他们成绩的平均数相同,方差分别为s2甲=5.5,s2乙=4.5

1个回答

  • s2甲=5.5,

    s2乙=4.5,

    s2丙=6.5,

    s2丁=4.3,

    s2丁最小,

    ∴成绩最稳定的同学是丁;

    故答案为:丁.