Evaluate the cumulative distribution function, F, for the given random variable, X, at specified values; also determine the requested probabilities.
Give exact answers in form of fraction.
F(1) =
F(2) =
F(3) =
(a) P(X ? 1.5) =
(b) P(X ? 3) =
(c) P(X > 2) =
(d) P(1 < X ? 2) =
f(x) = (125/31)(1/5)$^x$, x = 1,2,3