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# Unit 8: Random variables and probability distributions

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## About this unit

A random variable is some outcome from a chance process, like how many heads will occur in a series of 20 flips, or how many seconds it took someone to read this sentence. Calculate probabilities and expected value of random variables, and look at ways to transform and combine random variables.

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### Practice

- Graph probability distributionsGet 3 of 4 questions to level up!
- Probability with discrete random variablesGet 3 of 4 questions to level up!
- Develop probability distributions: Theoretical probabilitiesGet 3 of 4 questions to level up!

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- Mean (expected value) of a discrete random variableGet 3 of 4 questions to level up!
- Interpret expected valueGet 3 of 4 questions to level up!
- Standard deviation of a discrete random variableGet 3 of 4 questions to level up!

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### Practice

- Combining random variablesGet 3 of 4 questions to level up!
- Combining normal random variablesGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 240 Mastery points

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### Practice

- Identifying binomial variablesGet 3 of 4 questions to level up!
- Binomial probability formulaGet 3 of 4 questions to level up!
- Calculating binomial probabilityGet 3 of 4 questions to level up!

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### Practice

- Binomial vs. geometric random variablesGet 3 of 4 questions to level up!
- Geometric distributionsGet 3 of 4 questions to level up!
- Geometric probabilityGet 3 of 4 questions to level up!
- Cumulative geometric probabilityGet 3 of 4 questions to level up!

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Level up on all the skills in this unit and collect up to 1,700 Mastery points!#### Unit test

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