0 votes 0 votes Let $X$ be the number of Heads in $2$ fair coin tosses. Determine its p.m.f. Probability probability gravner engineering-mathematics + – Pooja Khatri asked Sep 24, 2018 Pooja Khatri 232 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
1 votes 1 votes Let the Random Variable for Number of Heads = X X can be 0 , 1 , 2 Probability for Heads = P Probability for Tails = 1 - P $P(X=0) = (1-P)*(1-P) = (1-P)^{2}$ $P(X=1) = P*(1-P) + (1-P)*P = 2P(1-P)$ $P(X=2) = P*P = P^{2}$ Aakash_ answered Sep 24, 2018 Aakash_ comment Share Follow See all 0 reply Please log in or register to add a comment.