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# Unit: Probability distributions & expected value

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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 ransform and combine random variables.### 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!

Level up on the above skills and collect up to 320 Mastery points

### Practice

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

### 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 320 Mastery points

Up next for you:

Level up on all the skills in this unit and collect up to 800 Mastery points!