Probability
Probability measures how likely something is, from 0 (impossible) to 1 (certain).
Key facts
- P(event) = ways it can happen ÷ total possible outcomes.
- All probabilities for one event add to 1.
- For two independent events, multiply: P(A and B) = P(A) × P(B).
Worked examples
Example 1
What is the probability of rolling two sixes with two dice?
- One six: 1/6
- Two sixes: 1/6 × 1/6 = 1/36
Answer: 1/36