Conditional ProbabilityFind the probability of one event happening given that another event has already happened. 
This is level 1: a mixed selection of conditional probability questions. You will be awarded a trophy if you get at least 9 answers correct and you do this activity online.
This is Conditional Probability level 1. You can also try:
InstructionsTry your best to answer the questions above. Type your answers into the boxes provided leaving no spaces. As you work through the exercise regularly click the "check" button. If you have any wrong answers, do your best to do corrections but if there is anything you don't understand, please ask your teacher for help. When you have got all of the questions correct you may want to print out this page and paste it into your exercise book. If you keep your work in an ePortfolio you could take a screen shot of your answers and paste that into your Maths file. 




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❎Probability  This is the basic probability set of exercises for those new to this topic.
Tree Diagrams  These diagrams can help solve certain types of conditional probability problems.
Venn Diagrams  This type of diagram is also a useful problem solving tool.
Level 1  A mixed selection of Conditional Probability questions
Exam Style Questions  A collection of problems in the style of GCSE or IB/Alevel exam paper questions (worked solutions are available for Transum subscribers).
More on this topic including lesson Starters, visual aids, investigations and selfmarking exercises.
Conditional probability is a measure of the likelihood of an event occurring given that another event has already occurred. It represents the probability of event A happening, given that event B has already occurred. It is denoted as P(AB), read as "the probability of A given B."
The formula for conditional probability is:
$$P(AB) = \frac{{P(A \cap B)}}{{P(B)}}$$
Where:
\(P(AB)\) is the conditional probability of event A given event B,
\(P(A \cap B)\) is the probability of both events A and B occurring,
\(P(B)\) is the probability of event B occurring.
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