The document contains a calculation of the probability P(E) of some event E occurring, where the event E has 3 possible outcomes out of a sample space S with a total of 8 possible outcomes, resulting in a probability of 37.50%.

4. HHT HTT
HHH HTH THT TTT
THH TTH

5. P(E) = |E| / |S| = 3 / 8 = .3750 = 37.50