Conditional Probability

Conditional Probability Quiz

Spec E8.4 · Cambridge IGCSE Maths: Quiz

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5 questions, one answer each

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  1. 1. What does 'conditional probability' mean?

    • A. The probability of an event given that another event has already occurred
    • B. The probability of two independent events both occurring
    • C. The probability that an event will never occur
    • D. The average of two probabilities

  2. 2. A bag has 4 red and 6 blue counters. One blue is drawn and not replaced. What is P(second is blue)P(\text{second is blue})?

    • A. 59\frac{5}{9}
    • B. 610\frac{6}{10}
    • C. 49\frac{4}{9}
    • D. 69\frac{6}{9}

  3. 3. In a table of 50 students, 20 study French, 12 of whom are boys. There are 25 boys total. Find P(studies French given boy)P(\text{studies French given boy}).

    • A. 1225\frac{12}{25}
    • B. 2050\frac{20}{50}
    • C. 1220\frac{12}{20}
    • D. 2550\frac{25}{50}

  4. 4. Is formal notation P(A∣B)P(A|B) required in IGCSE Cambridge Maths?

    • A. No, tables/trees/Venn diagrams are used instead
    • B. Yes, always required
    • C. Only at Core level
    • D. Only for tree diagrams

  5. 5. On a Venn diagram, region A contains 40 items, of which 25 are also in region B. What is P(B given A)P(B \text{ given } A)?

    • A. 2540\frac{25}{40}
    • B. 4025\frac{40}{25}
    • C. 25100\frac{25}{100}
    • D. 1540\frac{15}{40}

Quiz