Curriculum
Statistics — Third Secondary
Unit 1: Correlation and Regression
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Unit 2: Advanced Statistical Measures
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Unit 3: Probability
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Unit 4: Random Variables
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Unit 5: The Normal Distribution
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Text lesson
Conditional Probability and Independent Events
Conditional Probability and Independent Events
The multiplication rule
The multiplication rule
- From the definition of conditional probability we get the multiplication rule:
P(A ∩ B) = P(B) × P(A | B) = P(A) × P(B | A)
- This rule is useful in problems that happen in stages, such as drawing from a bag without replacement.
- A tree diagram helps to show the probabilities at each stage.
- We multiply the probabilities along each branch.
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