Q1
What does probability measure?
AHow likely an event is to happen
BHow fast an event happens
CHow big an event is
DNothing useful
ICSEClass 7 (ICSE)MathematicsCh 21 · Topic 2
Practice and Revision - Probability
Let us practise and revise what we learned about probability. Probability measures how likely an event is to happen, expressed as a number b
Core concept
Probability is calculated as (number of favourable outcomes) ÷ (total number of possible outcomes).
How it works
For example, the probability of rolling a 4 on a die is 1/6, since there's one favourable outcome out of six possible outcomes.
Why it matters
An event with probability 0 is impossible, while an event with probability 1 is certain to happen.
Key detail
Understanding probability helps us make informed decisions and predictions in games, weather forecasting, and everyday situations.
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Quick notes
• Probability measures how likely an event is.
• It ranges from 0 (impossible) to 1 (certain).
• Probability = favourable outcomes ÷ total outcomes.
• Rolling a 4 on a die has probability 1/6.
• There's one favourable outcome out of six.
• Probability 0 means impossible.
• Probability 1 means certain.
• Probability helps predictions and decisions.