Theoretical and empirical probabilities

1. two coins are tossed 100 times and it was found that 2-heads showed up 25 times. thus the probability of flipping two heads is 1/4.

2. selecting a king from a standard deck of cards has a probability of 1/13.

3. a hospital has found that 157 patients arrived with cardiac arrests and of these 21 died within the week. thus the probability of dying from a heart attack is 21/157.

4. the probabilty of selecting a red rock out of a bag that contains 5 red rocks and 12 blue rocks is 5/17

5. the buck's have a 2/5 chance to win the game