How would I be able to find the z-score given the value. Im having trouble with the empirical rule.

1: Find the z-score corresponding to the given value of x. Please notice the notation X ~ N(12, 4) means that X is a random variable with normal distribution, where u = 12 and o = v4 = 2 a: X ~ N (12, 4), x = 13 b: X ~ N(20, 9), x = 15 c: X ~ N (162, 25), x = 160 d: X ~ N(38, 16), x = 45 2: Given that X ~ N(16, 2.52), write the following in terms of probabilities of the standard normal variable. a: For example P(X 19.2) d: P(X 2 8.6) e: P(12.5