19. General: Coin Flip An experiment consists of tossing a coin a specified number of times and recording the outcomes.

(a) What is the probability that the first head will occur on the second trial?

Does this probability change if we toss the coin three times? What if we toss the coin four times? What probability distribution model do we use to compute these probabilities?

(b) What is the probability that the first head will occur on the fourth trial?

after the fourth trial?