E ( X ) = ∑ x i p i E(X)=\sum_{}^{} x_{i} p_{i} E(X)=∑xipi
EXCEL formula: sumproduct (random variable, probability distribution)
D ( X ) = ∑ ( x i − x ‾ ) 2 p i D(X)=\sum_{}^{ }\left ( x_{i} -{\overline{x} } \right )^{2 } p_{i} D(X)=∑(xi−x)2pi
EXCEL formula: sumproduct (squared difference of random variables, probability distribution)
【EXCEL】Calculate the expectation and variance of discrete random variables
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