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JSS2: MATHEMATICS - 3RD TERM

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  1. Scale Drawing | Week 1
    3 Topics
    |
    1 Quiz
  2. Angles of Elevation & Depression | Week 2
    3 Topics
    |
    1 Quiz
  3. Pythagoras’ Theorem I | Week 3
    3 Topics
    |
    1 Quiz
  4. Pythagoras’ Theorem II | Week 4
    2 Topics
    |
    1 Quiz
  5. Area and Volume of Cones and Cylinders | Week 5
    3 Topics
    |
    1 Quiz
  6. Cones | Week 6
    3 Topics
    |
    1 Quiz
  7. Bearings and Distances I | Week 7
    2 Topics
    |
    1 Quiz
  8. Bearings and Distances II | Week 8
    2 Topics
    |
    1 Quiz
  9. Presentation of Data | Week 9
    6 Topics
    |
    1 Quiz
  10. Probability | Week 10
    6 Topics
    |
    1 Quiz



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Topic Content:

  • Mutually Exclusive Events

Two or more events are mutually exclusive if one outcome prevents another outcome from happening. E.g. if you throw a coin, you can only obtain one side at a time i.e. a tail or head. Therefore, throwing a coin is mutually exclusive. 

If events P and Q are mutually exclusive, then the probability of P or Q is: 

P (P or Q) = P (P) + P (Q)

This is called the addition Rule or the OR rule. When you use OR, you add. 

Note: If a question contains the word “or” or “either/or”, use the addition rule to solve it.

Example 10.4.1:

If 7 women, 2 men, 5 girls, and 6 boys have an equal chance of winning a game. What is the probability that:
(a) a boy will win first,
(b) a girl or woman or a man will win first? 

Solution 

 

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