Teach Genie
Teach it back in your own words, spot gaps, and remember it better.
Probability describes how likely an event is when the result is random. It is always a number from 0 to 1, where 0 means impossible and 1 means certain.
An outcome is one possible result, such as landing on blue. An event is the result you care about, and we write its probability as P(blue)P(\text{blue})P(blue).
If a question lists every possible outcome, their probabilities must add to 1. In symbols, P(all outcomes)=1P(\text{all outcomes}) = 1P(all outcomes)=1, and this helps you find missing values and check your answers.
Question 1
2 marksThe probability that a biased dice will land on a 6 is 0.3
The dice is going to be rolled 200 times.
What are the minimum and maximum possible values for any probability?
Revision notes for Edexcel GCSE Maths Probability. Open the guide for explanations and worked examples. Written against the Edexcel GCSE Maths (1MA1) specification, so the content matches what's examinable rather than general Maths background.
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A biased coin has a probability of 0.620.620.62 of landing on heads. It is tossed 150 times. Estimate the number of times it will land on heads.
