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# Unit: Probability and combinatorics

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### About this unit

Probability and combinatorics are the conceptual framework on which the world of statistics is built. Besides this important role, they are fascinating, fun, and often surprising!### Learn

### Practice

- Probability with general multiplication ruleGet 3 of 4 questions to level up!
- Interpret probabilities of compound eventsGet 3 of 4 questions to level up!

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

### Learn

### Practice

- PermutationsGet 3 of 4 questions to level up!

### Learn

### Practice

- Probability with permutations and combinationsGet 3 of 4 questions to level up!

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

### Learn

### Practice

- Graph probability distributionsGet 3 of 4 questions to level up!
- Probability with discrete random variablesGet 3 of 4 questions to level up!

### Learn

### Practice

- Develop probability distributions: Theoretical probabilitiesGet 3 of 4 questions to level up!
- Develop probability distributions: Empirical probabilitiesGet 3 of 4 questions to level up!

### Practice

- Use probabilities to make fair decisionsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 400 Mastery points

### Learn

### Practice

- 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!
- Find expected payoffsGet 3 of 4 questions to level up!

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

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Level up on all the skills in this unit and collect up to 1400 Mastery points!