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
Probability distribution and its conditions
Probability distribution and its conditions
- The probability distribution of a discrete random variable is a table or a rule that shows each value x of X and its probability f(x) = P(X = x).
- For the table to be a valid probability distribution, two conditions must hold:
- Each probability satisfies 0 ≤ f(x) ≤ 1.
- Σ f(x) = 1.
- If the second condition is not satisfied
- the table is wrong and the calculation must be checked.
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