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Statistics and Probability
Quick questions on Basic probability explained: N(A)-Level Mathematics Statistics and Probability
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the probability scale?Show answer
Probability measures how likely something is, on a scale from to :
What are equally likely outcomes?Show answer
When all outcomes are equally likely (a fair die, a well-shuffled pack), the probability of an event is:
What is counting outcomes carefully?Show answer
The key step is counting correctly. List the favourable outcomes and the total outcomes, then form the fraction. For "an even number on a die", the favourable outcomes are (three of them), so the probability is .
What is the complement rule?Show answer
The outcomes of an event and its opposite (its complement) together cover everything, so their probabilities add to :
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