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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



Lesson 10, Topic 5
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Impossible and Certain Events

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Topic Content:

  • Impossible and Certain Events

1. The total probability of mutually exclusive events = 1, which means the events are certain to happen.

2. The probability of an impossible event is 0. E.g. the probability of obtaining a 9 in a throw of dice is 0, which means it is impossible. 

The Probability that an Event Will Not Happen: 

If the probability that an event (E) is happening is “P (E happening)”, then the probability that event (E) is not happening is: 

P (E not happening) = 1 – P (E happening) 

Example 10.5.1: 

Out of 40 pupils in a class, 10 pupils are wearing glasses. What is the probability that a pupil picked at random will not be wearing glasses? 

Solution

No of possible outcomes = 40 

 

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