Problem 2. (10 points) Suppose random variable N has PMF PN(n) = { cn, n (-2,-1,1, 2} 0, otherwise 1. What is the value of constant c? (2 points) 2. What is P(N 1), the probability that N is greater than or equal to 1? (3 points) 3. What is P(-1 N0), the probability that K is between -1 and 0? (3 points) 4. What is E[N], the expected value of N? (2 points)