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
Discrete Random Variables
Discrete Random Variables
Probabilities of events related to the variable
Probabilities of events related to the variable
- We find the probability of any event about the variable by adding the probabilities of the values included in it. For example:
- P(X ≤ a) = the sum of f(x) for all values x that are less than or equal to a.
- P(X ≥ a) = the sum of f(x) for all values x that are greater than or equal to a.
- P(a ≤ X < b) = the sum of f(x) for all values x with a ≤ x < b, so b is not included.
- It helps to list the values included in the event on a separate line before adding, so that no value is missed or added twice.
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