在下列句子中随机地取一单词.以ξ表示取到的单词所包含的字母个数. 则Eξ= ． “THE GIRL PUT ON HER BEAUTIFUL RED HAT 题目和参考答案——青夏教育精英家教网—

题目内容

在下列句子中随机地取一单词，以ξ表示取到的单词所包含的字母个数，
则Eξ=____．

“THE GIRL PUT ON HER BEAUTIFUL RED HAT”

答案：3.75

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