1. Lesson 3

1.1. Discover

Mathematics 30-3 Module 1

Module 1: Probability

 

Discover
 

You have been calculating the experimental and theoretical probability of an event. You know that You will now examine the probability of event A not occurring.

 

Try This 1

 

Consider the following set of shapes.

 

This is an image of a variety of red, blue, and green squares, circles, stars, and triangles.

  1. Complete the following table to show the number of each type of shape. The first row has been completed for you.

     

    Red

    Green

    Blue

    Total

    Triangle

    1

    2

    1

    4

    Square

     

     

     

     

    Star

     

     

     

     

    Circle

     

     

     

     

    Total

     

     

     

     
  2.  
    1. Suppose you were to choose a shape at random. Explain how you could compare the chance of getting a shape that is red to the chance of getting a shape that is not red.
    2. Use the strategy you described above to compare the chance of getting a square to getting a shape that is not a square.
  3.  
    1. Calculate the probability of choosing a shape that is red, and the probability of choosing a shape that is not red.
    2. Calculate the probability of choosing a square and choosing a shape that is not a square.
    3. Calculate the probability of choosing each colour.

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Share 1

 

With a partner or in a group, share your responses from the Try This 1.

  • How did your strategies for calculating the chance of getting a specific shape, and the chance of not getting a specific shape from question 2 compare?
  • How are the probabilities you calculated in question 3 related to the comparisons you made in question 2?

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There are 6 red shapes out of 17 and 11 non-red shapes out of 17. You could say the ratio of red to non-red is 6:11.