4-6. Determine the cumulative distribution function F(X) given the following probability mass function. Use F(X) to determine:

(a) P(0 < X ≤ 2)

(b) P(X ≤ 1)

(c) P(−1 < X ≤ 2)

(d) P(−1 < X ≤ 0)

X f(X)

−1 0.5787 1 0.3472 2 0.0694 3 0.0046 1.0000