Given that, (0.50) = 0.69146 and (1.00) = 0.84134 and X N(0, 1), determine the

Given that, Φ (0.50) = 0.69146 and Φ(1.00) = 0.84134 and X ∼ N(0, 1), determine the following probabilities.

a. P(X > 0.50)

b. P(−1 < X < 0.50)