Subjects › Probability & Statistics
Probability basics
Sample spaces, complements, unions, and independence.
The idea
Nearly every error is adding probabilities that should be multiplied, or forgetting to subtract an overlap. Drawing the sample space fixes both.
Lesson
No lesson built yet. The worked solutions below are the material it would be assembled from.
Questions (5)
| Question | Type | Difficulty | Drift | Accuracy |
|---|---|---|---|---|
| A fair six-sided die is rolled once. What is the probability of rolling an even number? Give your answer as a … | numeric | Easy -1.30 | — | — (0) |
| The probability it rains tomorrow is 0.3. What is the probability it does not rain? | numeric | Easy -0.50 | — | — (0) |
| Two fair coins are tossed. What is the probability of getting exactly one head? Give a decimal. | numeric | Moderate 0.30 | — | — (0) |
| A card is drawn from a standard 52-card deck. What is the probability it is a heart OR a king? Give your answe… | numeric | Hard 0.60 | — | — (0) |
| A coin has landed heads five times in a row. A gambler says the next toss is 'due' to be tails. What is wrong … | short | Hard 1.10 | — | — (0) |