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
Random variables and their range
Random variables and their range
- A random variable is a function that assigns exactly one real number to each outcome of a random experiment.
- It is usually denoted by the capital letter X, and its values by the small letter x.
- For example, if two coins are tossed and X is the number of heads, then X takes the values 0, 1 or 2.
- The range of a random variable is the set of all values it can take.
- The variable is discrete when its range is a set of separate values that can be counted, such as 0, 1, 2, 3.
- Otherwise it is continuous.
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