Mathematics Probability & Statistics 1 9709: PROBABILITY Topical Past Paper Questions

For her morning break, Jules has a drink. She has tea, juice or water, with probabilities 0.2, 0.35 and 0.45 respectively. When she has tea, the probability that she has a cake is 0.25. When she has juice, the probability that she has a cake is 0.4. When she has water, the probab…

Priti has two bags of discs, X and Y. Bag X contains 8 red discs and 7 blue discs. Bag Y contains 6 red discs and 9 blue discs. Priti tosses a fair coin. If she obtains a head, she chooses at random and without replacement two discs from bag X. If she obtains a tail, she chooses…

A bag contains 9 blue marbles and 3 red marbles. One marble is chosen at random from the bag. If this marble is blue, it is replaced back into the bag. If this marble is red, it is not returned to the bag. A second marble is now chosen at random from the bag. (a) Find the probabi…