随机变量X的概率密度为F(x)={A/根号(1-x^2) |x|=1 问,A=?答案=1/π...怎么算的P{-1/2
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![随机变量X的概率密度为F(x)={A/根号(1-x^2) |x|=1 问,A=?答案=1/π...怎么算的P{-1/2](/uploads/image/z/2340950-14-0.jpg?t=%E9%9A%8F%E6%9C%BA%E5%8F%98%E9%87%8FX%E7%9A%84%E6%A6%82%E7%8E%87%E5%AF%86%E5%BA%A6%E4%B8%BAF%28x%29%3D%7BA%2F%E6%A0%B9%E5%8F%B7%281-x%5E2%29+%7Cx%7C%3D1+%E9%97%AE%2CA%3D%3F%E7%AD%94%E6%A1%88%3D1%2F%CF%80...%E6%80%8E%E4%B9%88%E7%AE%97%E7%9A%84P%7B-1%2F2)
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