Probability and conditional probability: practice and worksheets
Calculate simple, compound, and conditional probabilities using tables, diagrams, and probability rules.
Concept overview
Probability measures how likely an event is on a scale from 0 to 1. Conditional probability restricts attention to outcomes where another event has already occurred.
Key points
- Use the addition rule for “A or B” and subtract overlap when events can occur together.
- Use multiplication for sequential independent events.
- Compute P(A|B) by dividing the probability of A and B by the probability of B.
Worked example
If 12 of 30 students play a sport and 8 of those 12 also play an instrument, then P(instrument | sport) = 8/12 = 2/3.
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Questions by difficulty
Probability and conditional probability worksheet practice
Use the printable worksheet for independent practice, then check the answer key and worked explanations.
Frequently asked questions
How should I practice Probability and conditional probability?
Start with foundation questions, check each answer, and move up a level after several correct answers in a row.
How many practice questions are available?
IQClub currently has 23 published questions for this skill.
Can I use this for test preparation?
Yes. The practice reinforces school mathematics and the same reasoning used in high-school tests and entrance exams.