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Probability, with a bag of marbles
Play Probability Basics
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How to play Probability Basics
- Read the first step: probability compares favourable outcomes with all outcomes.
- Move the sliders and switches to change the diagram and watch what happens. The readout under the picture shows the numbers.
- Answer each question. If you are wrong you get a hint and can try again, with no penalty.
- Some steps ask you to make something happen, such as hitting a target value. Experiment until it works.
- Finish the lesson to earn XP and see how many questions you got right first time.
Tips and strategy
- Do not rush. The controls are there to be played with, so try extreme values as well as sensible ones.
- Say what you notice out loud or write it down before you press Continue.
- Use the hint when you are stuck, and then try to explain the answer in your own words.
- Count the marbles you want, then count all of them for the bottom number.
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FAQ
Probability Basics: questions
What is probability?
A number from 0 to 1 that tells you how likely an event is. 0 means impossible, 1 means certain.
How do you find a probability?
Divide the number of outcomes you want by the total number of equally likely outcomes.
What does a probability of 0.5 mean?
An even chance, like getting heads when you toss a fair coin.
What age is this lesson for?
It suits ages 9 to 13, when children start to use fractions and percentages to describe chance.
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