[問題] 關於期望值
若 Y,B皆為隨機變數,且B的期望值與變異數均存在
P(Y = B) = p
P(Y = 0) = q = 1-p
則 E(Y) = pE(B) + q0
我想問的是根據期望值定義
答案不是應該是
E(Y) = pB + q0
為什麼 B 要多加一個期望值呢???
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