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
Lesson summary
Lesson summary
- A random variable is a function that links the outcomes of an experiment to real numbers, and its range is the set of its values.
- A discrete variable has a range of separate values that can be counted.
- The two conditions of a probability distribution 0 ≤ f(x) ≤ 1, and Σ f(x) = 1.
- The probability of any event is found by adding the probabilities of the values included in it.
- The condition that the probabilities add up to 1 is used to find an unknown constant.
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