Mathematics
Senior High
請問第二題的xi我應該放什麼，1嗎
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例題6 隨機變數的期望值、變異數與標準差(一)
擲3枚均勻硬幣一次,設隨機變數X表示出現的正面次數,試求隨機變數 X 的
(1)期望值。(4分)
(2)變異數。(4分)
(3)標準差。(2分)
解
(1)
立
(2)
:
(3)
= M
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