4. Suppose you roll a fair die. Then S = {1,2,3,4,5,6). Let X(() = [(/2] where [(/2] is the greatest integer less than or equal to (/2. i.e., [(/2] is the "rounded down" version of (/2. Find the following: a) P({X = 0}) c) P((X = 2)) b) P((X = {0,1]]) d) P((X = 1.5})