1) P(A) = 0.9, P(B) = 0.4 and P(A ∩ B) = 0.3. Are A and B independent? a) Independent b) Not independent c) Not enough information 2) P(A) = 0.7, P(B) = 0.5. Is it possible for these events to be mutually exclusive? a) No b) Yes 3) If two dice are rolled, what formula should be used to calculate the probability of getting at least one 6? a) P(A U B) = P(A) + P(B) - P(A ∩ B) b) P(A U B) = P(A) + P(B) 4) Events P and Q are independent if P(A∩B) = P(A) P(B). a) True b) False 5) P(A) = 0.5 and P(B) = 0.3. A and B are mutually exclusive events. What is P(A U B)'? a) 0.2 b) 0.3 c) 0.5 d) 0.7 6) Which of these events are not independent a) Flipping a coin and rolling a dice. b) Rolling two dice. c) Picking a card from a deck and then picking a second card. d) Flipping two coins. 7) P(A) = 0.3 and P(B) = 0.5. Are these events independent? a) Independent b) Not Independent c) Not enough information 8) When choosing a day at random the probability of it snowing that day is P(snow) and the probability that it is December is P(December). These events are ... a) mutually exclusive b) not mutually exclusive c) independent d) not independent 9) Which of these events are mutually exclusive? a) It is raining and it is cloudy. b) Rolling a 2 and a 3 in a single dice roll. c) A football team both win and lose their final match. d) It is raining and a football team win their final match.

GCSE Stats 2

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