Probability Scale
The probability scale represents chance by numbers from 0 to 1, where 0 means impossible and 1 means certain.
Practice This ConceptMain explanation
Teacher explanation
Any valid probability lies between 0 and 1. It may be written as a fraction, decimal, or percentage, such as 1/2, 0.5, or 50%. Larger probability means greater chance.
Example
The probability of getting heads on a fair coin is 1/2, which is 0.5 or 50%.
Simple analogy
Probability never crosses 1 because 1 already means sure.
Common confusion
Students sometimes write probabilities greater than 1, such as 6/4, after counting incorrectly.
Exam tip
After calculating, check whether your answer lies between 0 and 1. If not, the counting is wrong.
Answer writing and exam use
1-mark use
Write the exact meaning of probability scale in one clean line.
2-mark use
Define probability scale and add one example or condition.
3-mark use
Explain probability scale, show the method or example, and mention the common mistake.
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