帮忙解答下概率论中的数学期望!详见图片帮忙详细解答下!个人以为先算E(X的平方)就会后面了,但不会算!
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![帮忙解答下概率论中的数学期望!详见图片帮忙详细解答下!个人以为先算E(X的平方)就会后面了,但不会算!](/uploads/image/z/11281184-8-4.jpg?t=%E5%B8%AE%E5%BF%99%E8%A7%A3%E7%AD%94%E4%B8%8B%E6%A6%82%E7%8E%87%E8%AE%BA%E4%B8%AD%E7%9A%84%E6%95%B0%E5%AD%A6%E6%9C%9F%E6%9C%9B%21%E8%AF%A6%E8%A7%81%E5%9B%BE%E7%89%87%E5%B8%AE%E5%BF%99%E8%AF%A6%E7%BB%86%E8%A7%A3%E7%AD%94%E4%B8%8B%21%E4%B8%AA%E4%BA%BA%E4%BB%A5%E4%B8%BA%E5%85%88%E7%AE%97E%EF%BC%88X%E7%9A%84%E5%B9%B3%E6%96%B9%EF%BC%89%E5%B0%B1%E4%BC%9A%E5%90%8E%E9%9D%A2%E4%BA%86%2C%E4%BD%86%E4%B8%8D%E4%BC%9A%E7%AE%97%21)
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