[中學] 期望值
請教一題期望值
某家餐館推出五種套餐
每位客人都隨機選一種餐點
請問平均多少客人,這五種餐點皆被點過?
感謝
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推
08/15 12:46, , 1F
08/15 12:46, 1F
→
08/15 12:58, , 2F
08/15 12:58, 2F
→
08/15 13:21, , 3F
08/15 13:21, 3F
→
08/15 16:00, , 4F
08/15 16:00, 4F
→
08/15 17:47, , 5F
08/15 17:47, 5F
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