Mathematics · Grades 6–10
Probability: what a result does and does not show · revision card
Equal counting works only when the individual outcomes are equally likely.
Keep these ideas clear
Count the sample space
Equal counting works only when the individual outcomes are equally likely.
Long-run versus one trial
A probability is not a promise about the next result or a small number of trials.
Two useful examples
A fair six-sided die is rolled. What is the probability of an even number as a simplest fraction?
1/2
1/2
A fair six-sided die is rolled. What is the probability of a result greater than 4?
1/3
1/3
Explain it without looking
- Explain why a probability greater than 1 indicates a mistake in an ordinary probability calculation.
Learning preview · teacher review required. Grade bands are approximate, not official curriculum alignment.