请问怎么根据这个密度函数求出y的期望和方差�，请求大神指导一下，十分感谢 知乎 Sketch Coloring Page

请问怎么根据这个密度函数求出y的期望和方差�，请求大神指导一下，十分感谢 知乎 Template

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tomski请问怎么根据这个密度函数求出y的期望和方差�，请求大神指导一下，十分感谢 知乎 coloring

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