Var X E X2 E X 2

• Var X1+x2+x3+x4
• Var X1+x2 Var X1 +var X2
• Variance Formula E X 2
• Var X E Var X Y + Var E X Y
• Var Xy Var X Var Y
• X服从 A B 均匀分布 求 E X Var X 。
• Error In Var X : X'为null
• Var X+y Formula

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Var X E X2 E X 2

Var X E X2 E X 2

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Var X E X2 E X 2