Idea 22of 22Builds onSame chance, different spinners
Use probability to decide
How can probability help you choose what to do?
Today you'll discover
- how to compare two bags
- how to pick the better one
- how to avoid what you don't want
Think firstYou win a prize if you pick orange
You win a prize if you pick orange. Which bag should you pick from?
Decide first, then press Next. Compare the two chances, then choose.
Two jars of marbles side by side: bag A with 3 orange and 7 blue, bag B with 2 orange and 3 blue. The marbles are counted, the orange ones outlined, and the fractions 3/10 and 2/5 are written under them; the line under both reads 3/10 and 2/5 = 4/10: bag B is more likely to give orange. The last step shows bags X and Y for green.
See the whole ideathe big idea and the key word, in one place
The big idea
Make an informed decision: compare the probabilities, then choose the better chance.
Real choicesWhich raffle to enter, which game to play, whether to take an umbrella: compare the chances first.
Easy to get wrongMore of what you want is not always better. Bag A has 3 orange, but 3/10 is less than bag B's 2/5.
Key word
- informed decision
- a choice made by comparing the facts, like the chances
Ready to use it?
- Use probabilities to choose between two bags or spinners.