Suppose that T and Z are random variables.

a. If P(T > 0.3) = 0.1 and P(T < −3.0) = 0.05, determine P(−3.0 ≤ T ≤ 0.3).

b. Suppose that P(−0.8 ≤ Z ≤ 0.8) = 0.90 and also suppose that P(Z > 0.8) = P(Z < −0.8). Find P(Z > 0.8).