In the following, without computing the actual probabilities, state whether the probability is greater than 0.5, lower than 0.5, equal to 0.5, or if it is not possible to tell just by common sense. Explain your reasoning.
a) P(X > 113) when X ∼ N(50, 3).
b) P(59 ≤ X ≤ 81) when X ∼ N(65, 2).
c) P(X ≤ 7) when X ∼ N(30, 2).