复合泊松分布的均值和方差是什么
复合泊松分布是由泊松分布和另一种分布的卷积得到的分布。假设泊松分布的均值为λ1，方差为σ1^2，另一种分布的均值为λ2，方差为σ2^2。
复合泊松分布的均值为 λ1 + λ2，即两个分布的均值之和。
复合泊松分布的方差为 σ1^2 + σ2^2，即两个分布的方差之和。
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