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
Finding an unknown constant in a distribution
Finding an unknown constant in a distribution
- Sometimes a question gives a distribution with an unknown value.
- We use the condition that the probabilities add up to 1 to find it.
- For example, if the probabilities are 0.1, a, 0.3 and 0.2, then 0.1 + a + 0.3 + 0.2 = 1, so a = 0.4.
- This method appears in many exam questions.
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