Example # 8: A couple has three children. Find each probability: a) All boys b) All boys or all girls c) Exactly 2 girls or exactly 2 boys d) At least one child of each gender e) All girls or exactly one boy f) Exactly one child of each gender Empirical Probability Empirical probability relies on actual experience to determine the likelihood (probability) of outcomes. Formula for Empirical Probability Given a frequency distribution, the probability of an event being in a given class is P(E)= Frequency for the class Total frequencies in the distribution This probability is denoted by P(E)= " n(E) n(S)