Toss a fair coin twice, and let x be defined as the number of heads observe. which of the following is correct ? (p.(k) denotes the pmf) (a) p(0) 1/2 b)p)=2/3 p

toss a fair coin twice, and let X be defined as the number of heads observe. Which of the following is correct ? (P.(k) denotes the PMF) (A) P(0) 1/2 B)P)=2/3 P2) 1/4 (C) P(2) 3/4 (C)