The angle θ between the vectors \(\rm \vec{a} = 5\hat{i} - \hat{j} + \hat{k}\) and \(\rm \vec{b} = \hat{i} + \hat{j} - \hat{k}\) equals to
If a random variable \( x \) has the probability distribution then \( P(3<x \leq 6) \) is equal to