CHALLENGE ACTIVITY 8.7.1: Linearity of expectations. 380992.2217766.qx3zqy7 Jump to level 1 A biased coin comes up heads with probability and tails with probability CT / CO The coin is flipped 6 times. For every flip that comes up heads, you win 4 dollars. For every flip that comes up tails, you lose 9 dollars. D is the random variable that is equal to your net gain in dollars. If you lose 2 dollars, then D = -2. What is the expected value of D? E[D] = EX: 1.23