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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 
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大學統計學和機率
Dec 25th 2013, 07:59

81%的孩子,都曾經同時使用多種媒體。假設一個家庭中,平均有三個在學孩子,現隨機抽取一個家庭,試求:
1.三個在學孩子皆使用多種媒體的機率?
2.至多二個在學孩子使用多種媒體的機率?

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