Probability questions are usually lost in the reading. Decide first whether the events are independent, then whether the question says 'and' or 'or'.
Introduction to Probability
Probability puts a number on how likely something is, and that number always lies between 0 and 1. You need the scale, the fraction of favourable outcomes over total outc...
7 questions · 15 marks
Revise this topicRelative and Expected Frequencies
An experiment does not have to give you a neat fraction. When you cannot work out a probability from equally likely outcomes, you run the experiment and use the relative ...
7 questions · 15 marks
Revise this topicProbability of Combined Events
Two things happening at once is what Cambridge means by combined events, and the whole topic comes down to two rules: multiply for 'and', add for 'or'. You also need to r...
8 questions · 20 marks
Revise this topicConditional Probability
A conditional probability answers a question that has already told you something: the probability of A given that B has happened. The whole skill is deciding which group ...
7 questions · 20 marks
Revise this topic