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03_离散型随机变量的数字特征 ​

知识点 1 离散型随机变量的均值 ​

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例题 1 ​

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例题 2 ​

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例题 3 ​

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知识点 2 离散型随机变量的方差 ​

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例题 1 ​

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例题 2 ​

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例题 3 ​

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知识点 3 两点分布的均值与方差公式 ​

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例题 ​

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