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Які з наведених нижче властивостей числових характеристик мають місце?
1) M(X+Y) = M(X) + M(Y)
2) D(X-Y) = D(X) - D(Y)
3) M(C*X) = C*M(X), де С=const
4) D(C*X) = C*D(X), де С=const
5) M(X-M(X))^2 = M(X^2) - (M(X))^2
6) M(X-M(X)) = 0
7) D(C) = C, де С=const
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