It is easy to calculate the probability of rolling a 6 on a six sided die, because we know how many possible outcomes there are, and how many of them are a 6. However, when you have 2 or more events (such as rolling 2 dice) it may be harder to determine the probability of something like "the 2 dice add up to 9 or more".  In these cases, it helps to list all of the possible outcomes and see how many of them are the ones that you want.

Today, we will be reviewing some basic ideas around probability, and then see how we can use tree diagrams or tables to help us determine a list of all of the possible outcomes.  

Vocabulary you need to know:

  • event
  • outcome
  • sample space
  • indepenent events

Things you should be able to do after today:

  • Determine the probability of an outcome using a sample space
  • Determine a probabilty as a fraction, a decimal or a percent
  • Determine a sample space for 2 or more events using a tree diagram
  • Determine a sample space for 2 independent events using a table


  • Notes


  • p416 #3-8, 10 
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