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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Mathematicians are not the people who find Maths easy; they are the people who enjoy how mystifying, puzzling and hard it is. Are you a mathematician? Comment recorded on the 26 March 'Starter of the Day' page by Julie Reakes, The English College, Dubai: "It's great to have a starter that's timed and focuses the attention of everyone fully. I told them in advance I would do 10 then record their percentages." Comment recorded on the 19 June 'Starter of the Day' page by Nikki Jordan, Braunton School, Devon: "Excellent. Thank you very much for a fabulous set of starters. I use the 'weekenders' if the daily ones are not quite what I want. Brilliant and much appreciated." 
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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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Don't wait until you have finished the exercise before you click on the 'Check' button. Click it often as you work through the questions to see if you are answering them correctly. You can doubleclick the 'Check' button to make it float at the bottom of your screen.
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