1. ©G Dear 2009 – Not to be sold/Free to use
Language
of Chance
General Mathematics
Preliminary
Equally Likely
Outcomes
Stage 6 - Year 11
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©G Dear 2009 – Not to be sold/Free to use

2. (Un)Equally Likely Outcomes (1/4)
Random Events
means NO bias in favour of one event over another.
=INT(RAND()*99)+1
Random Number Generator

3. Equally Likely Outcomes (2/4)
Probability can’t be calculated unless all individual outcomes are equally likely. 2 1 1 1 2 1 2 3 2 4 3 4 3 4 5 4 5 5 6
Yellow, Red and Green ARE equally likely.
Yellow, Red and Green ARE NOT equally likely.

4. Equally Likely Outcomes (3/4)
versus
Is a Win for the Sharks equally as likely as a win for the Eels?
No!
No!
No!

5. Equally Likely Outcomes (4/4)
The Sample space for a dice.
S = {1, 2, 3, 4, 5, 6}
All events are equally likely.
Sample space for the sum of 2 die. + 1 2 3 4 5 6 7 8 9 10 11 12
Note: 7 is more likely than 3.
All events are still equally likely.