Which of the two methods for determining relative-frequency probabilities (given in Section 14.2) was used to determine

Question:

Which of the two methods for determining relative-frequency probabilities (given in Section 14.2) was used to determine each of the following?
a. On any given day, the probability that a randomly selected American adult will read a book for pleasure is .33.
b. The probability that a five-card poker hand contains “four of a kind” is .00024.