If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

# Unit: Probability

#### 0

Possible mastery points

## Probability basics

Practice
Simple probabilityGet 5 of 7 questions to level up!
Experimental probabilityGet 5 of 7 questions to level up!
Making predictions with probabilityGet 5 of 7 questions to level up!
Comparing probabilitiesGet 5 of 7 questions to level up!
Probability modelsGet 5 of 7 questions to level up!

#### Quiz 1

Level up on the above skills and collect up to 500 Mastery points

## Counting with permutations

Practice
The counting principleGet 3 of 4 questions to level up!
PermutationsGet 3 of 4 questions to level up!

## Counting with combinations

Practice
CombinationsGet 3 of 4 questions to level up!

## Probability with counting, permutations, combinations

#### Quiz 2

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

## Multiplication rule for independent events

Practice
Probabilities of compound eventsGet 3 of 4 questions to level up!
Independent probabilityGet 3 of 4 questions to level up!

## Multiplication rule for dependent events

Practice
Dependent probabilityGet 3 of 4 questions to level up!

## Addition rule for probability

Practice
Adding probabilitiesGet 3 of 4 questions to level up!

#### Quiz 3

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

## Expected value

Up next for you:

#### Unit test

Level up on all the skills in this unit and collect up to 1300 Mastery points!

### About this unit

Few things are certain in life. Probability gives us an idea of the likelihood or unlikelihood of different outcomes.