请教一道方差计算题-22%-17.4%)^2×0.1+(-2%-17.4%)^2×0.2+(20%-17.4%)^2×0.4+(35%-17.4%)^2×0.2+(50%-17.4%)^2×0.1=多少,麻烦列出计算过程,

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请教一道方差计算题-22%-17.4%)^2×0.1+(-2%-17.4%)^2×0.2+(20%-17.4%)^2×0.4+(35%-17.4%)^2×0.2+(50%-17.4%)^2×0.1=多

请教一道方差计算题-22%-17.4%)^2×0.1+(-2%-17.4%)^2×0.2+(20%-17.4%)^2×0.4+(35%-17.4%)^2×0.2+(50%-17.4%)^2×0.1=多少,麻烦列出计算过程,
请教一道方差计算题
-22%-17.4%)^2×0.1+(-2%-17.4%)^2×0.2+(20%-17.4%)^2×0.4+(35%-17.4%)^2×0.2+(50%-17.4%)^2×0.1=多少,麻烦列出计算过程,

请教一道方差计算题-22%-17.4%)^2×0.1+(-2%-17.4%)^2×0.2+(20%-17.4%)^2×0.4+(35%-17.4%)^2×0.2+(50%-17.4%)^2×0.1=多少,麻烦列出计算过程,
-22%-17.4%)^2×0.1+(-2%-17.4%)^2×0.2+(20%-17.4%)^2×0.4+(35%-17.4%)^2×0.2+(50%-17.4%)^2×0.1
=(-39.4%)^2×0.1+(-19.4%)^2×0.2+2.6%^2×0.4+17.6%^2×0.2+32.6%^2×0.1
=0.0155236+0.0075272+0.0002704+0.0061952+0.0106276
=0.040144