Which of the following is an example of theoretical probability? a. wendy flipped a coin 5 times, and the results were 4 tails. the probability of tails is 4/5 . b. kenny rolled a number cube 9 times and got 4 even numbers. the probability of an even number is 4/9 . c. there are 52 playing cards in a deck, and 4 of them are aces. the probability of turning over an ace is 4/25 . d. there were 73 people in a grocery store, and 45 of them bought milk. the probability of people buying milk is 45/73 .