20.2,20.2,20.2,20.1,20,20,19.9,19.8,19.8.方差怎么求s^2=1/n[(x1-m)^2+(x2-m)^2+.+(xn-m)^2]

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20.2,20.2,20.2,20.1,20,20,19.9,19.8,19.8.方差怎么求s^2=1/n[(x1-m)^2+(x2-m)^2+.+(xn-m)^2]20.2,20.2,20.2,20

20.2,20.2,20.2,20.1,20,20,19.9,19.8,19.8.方差怎么求s^2=1/n[(x1-m)^2+(x2-m)^2+.+(xn-m)^2]
20.2,20.2,20.2,20.1,20,20,19.9,19.8,19.8.
方差怎么求
s^2=1/n[(x1-m)^2+(x2-m)^2+.+(xn-m)^2]

20.2,20.2,20.2,20.1,20,20,19.9,19.8,19.8.方差怎么求s^2=1/n[(x1-m)^2+(x2-m)^2+.+(xn-m)^2]
平均值:x≈20
s^2=1/9[(20.2-20)^2+.+(19.8-20)^2]
≈0.024