0 votes 0 votes Let $X$ be a random variable with $P(X=1) =0.2, P(X=2) = 0.3$, and $P(X=3) = 0.5$. What is the expected value of $X$? Probability probability gravner engineering-mathematics + – Pooja Khatri asked Sep 24, 2018 Pooja Khatri 220 views answer comment Share Follow See 1 comment See all 1 1 comment reply Mk Utkarsh commented Sep 24, 2018 reply Follow Share $1 \times 0.2 + 2 \times 0.3 + 3 \times 0.5 =$$\large 2.3$ 1 votes 1 votes Please log in or register to add a comment.
Best answer 3 votes 3 votes $Expectation, E[X] = \sum x_{i} P(x_{i})$ $Expectation, E[X] = 1*0.2 + 2*0.3 + 3*0.5 = 2.3$ Aakash_ answered Sep 24, 2018 • selected Oct 4, 2018 by Mk Utkarsh Aakash_ comment Share Follow See all 0 reply Please log in or register to add a comment.