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 July 27th, 2018, 12:16 PM #1 Newbie   Joined: Jan 2018 From: brazil Posts: 4 Thanks: 0 Calculating probabilities I have a random variable that is defined by this probability function: $\displaystyle f(x) = kx^³$ $\displaystyle 0  July 27th, 2018, 02:05 PM #2 Global Moderator Joined: Dec 2006 Posts: 19,285 Thanks: 1681$\displaystyle \int_{0}^{\infty}\!\! f(x)dx = \int_{0}^1\! f(x)dx + \int_{1}^{\infty}\!\! f(x)dx\$ and that last integral is zero. Thanks from topsquark and coltson

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