[問題] 期望值
有紅綠藍三色球各五顆並編號1-5
取一顆的期望值
若是顏色則各色皆是1/3顆
若是數字則是3
若取共N顆(N不超過15)則將E(1)的期望值結果*N就好
不論條件是取回後放不放回或一次取幾顆
想問的是
""不論取回後放不放回或一次取幾顆""這個結論
若從數學上可以從期望值就是加權平均數來解釋
但想問有無其他更簡單或敘述性的解釋方法呢??
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