suppose that x ∼ n(−7, 14). find: (a) p(x ≤ 0) (b) p(x ≥ −10) (c) p(−15 ≤ x ≤ −1) (d) p(−5 ≤ x ≤ 2) (e) p(|x 7| ≥ 8) (f) the value of x for which p(x ≤ x)