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Class 11

Rules of Probability and Mixed Practice, Quiz

Five questions on the addition and complement rules and counting probabilities. Pick one answer for each.

5 questions, one mark each. 3 to pass. Suggested time: 10 minutes. Your answers are not recorded.

  1. P(A)=0.5P(A) = 0.5, P(B)=0.4P(B) = 0.4 and P(A∩B)=0.2P(A \cap B) = 0.2. Find P(A∪B)P(A \cup B).
  2. P(A)=38\displaystyle P(A) = \tfrac{3}{8}. Find P(not A)P(\text{not } A).
  3. A card is drawn from a pack of 5252. Find P(red card or king)P(\text{red card or king}).
  4. Two dice are rolled. Find the probability that the sum is 77.
  5. A committee of 22 is chosen at random from 44 men and 33 women. Find P(at least one woman)P(\text{at least one woman}).
Unanswered questions are marked wrong.

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