M4.6.1 For the adult
Listing all the outcomes
I roll two dice and add the scores. Which total comes up most often?
What this chapter teaches
To find a probability by counting, list every outcome so none is missed, and make sure the outcomes are equally likely. A table lists the outcomes of two events. The 36 pairs of two dice are equally likely, but the 11 totals are not.
Three questions to ask
There is no one right wording. Listen for the idea.
- How many outcomes are there when you toss a coin and roll a dice, and how do you know?
- Why is a total of 7 more likely than a total of 2 when you add two dice?
- Why is "HT" a different outcome from "TH" when you toss two coins?
After the chapter, the learner can
- List all the outcomes of two events in a table
- Find a probability from a table of outcomes
What they copy into their notebook
List every outcome in a table. Check that they are equally likely. P(event) = outcomes in the event ÷ outcomes in all. Two dice make 36 pairs, but the totals are not equally likely.