4. [20] A discrete random variable Y has CDF, $F_Y(y) = \begin{cases} 0 & y < 1, \\ 0.25 & 1 \le y < 2 \\ 0.5 & 2 \le y < 3 \\ 1 & y \ge 3 \end{cases}$ (a) [5] Find P[Y < 1]. (b) [5] Find P[Y = 3]. (c) [5] Find P[Y > 2]. (d) [5] Find P[Y ? 1].
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