My Math Forum Expectation and Variance

 April 19th, 2017, 08:18 PM #1 Member   Joined: Apr 2017 From: India Posts: 34 Thanks: 0 Expectation and Variance I am looking for the expectation and variance of a random Variable Y whose density function is: f(y)= 1-|y| for 1-|y|<1 0 , otherwise From Here , I have to evaluate the $\int yf(y)$ from $-\infty to \infty$ I am from here. Please help me out. Answer says Expectation is zero and Variance 1/6.
 April 20th, 2017, 02:48 AM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 1,977 Thanks: 1026 note that \$f(y) = \begin{cases}0 &y< -1 \\1-|y| &-1 \leq y \leq 1 \\ 0 &1

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