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在下列句子中随机地取一个单词,Have a good time,用X表示取到的单词包含的字母的个数,则E(X)=( )
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在下列句子中随机地取一个单词,Have a good time,用X表示取到的单词包含的字母的个数,则E(X)=( )
A、4
B、15/4
C、13/4
D、3
时间:2021-09-06 20:54
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石家庄铁道大学
概率论与数理统计
答案解析
C
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在下列句子中随机地取一个单词,Have a good time,用X表示取到的单词包含的字母的个数,则E(X)=( )
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Either the shirts or the sweater()a good buy
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