1 Suppose the weather forecaster says the probability of rain tomorrow is 3 Find the probability of no rain tomorrow 2 It has been estimated that 72 7 of alcoholics need professional help to stop drinking What is the probability that a random alcoholic can kick the habit without professional help 3 A marble is drawn at random from a box containing 3 yellow 4 white and 8 blue marbles Find the probability of drawing b a a yellow marble a blue marble d a white or blue marble