Flip a coin 4 times.
Each time a Head comes up you win $1. It costs $8 to play (paid once). How much money would you expect to make altogether? | |
[1] | A group of kids were timed running 100m. Here are the results:
What fraction of the kids run 100m in exactly 16s?
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[2] |
| You shoot an arrow at a target. There is a 90% chance of scoring a 30 and a 10% chance of scoring a 60. What average score do you expect to get if you do this many times? | |
[1] | A Crazy Die has 5 sides, but each side has a different probability of being rolled. This is is the probability distribution of the sides being rolled:
| | 0.2 | 0.25 | | 0.05 | 0.5 | | 1 | 2 | 3 | 4 | 5 | | Number |
What is the probability of rolling a number that is bigger than 2 and smaller than 5? | |
[1] |
| You shoot an arrow at a target. There is a 80% chance of scoring a 20 and a 20% chance of scoring a 50. What average score do you expect to get if you do this many times? | |
[1] | Roll 24 6-sided dice.
How many times would you expect to get more than or equal to 3? | |
[1] |
You roll 2 3-sided dice
You add the two numbers. What is the probability of getting more than or equal to 4? | |
[1] | Roll 1 6-sided die.
What is the probability of getting a number smaller than 4? | |
[1] |
Roll 1 6-sided die.
What is the probability of NOT getting a 5? | |
[1] | An obstacle course has 2 Fences and 1 Ditches. You have a 80% chance of clearing a Fence and a 100% chance of clearing a Ditch.
What is the probability of having a perfect run (clearing everything)? | |
[1] |
A Crazy Die has 5 sides, but each side has a different probability of being rolled. This is is the probability distribution of the sides being rolled:
| | 0.3 | 0.25 | 0.15 | 0.25 | 0.05 | | 1 | 2 | 3 | 4 | 5 | | Number |
What is the probability of rolling a number that is bigger than 5 and smaller than 4? | |
[1] | Cars go by on a road, each is a different color and type.
Probability of Color
| | 1 | | blue | purple | | Color |
Probability of Type
| | 0.8 | 0.2 | | wagon | sedan | | Type |
What is the probability of a car being a blue sedan? | |
[2] |
| A bag has 7 balls with number 6 and 5 balls with a number 9. What will be the average of the numbers of the balls taken out of the bag | |
[1] | A group of people were timed running 100m. Here are the results:
people
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| Time | 13 | 4 | | 14 | 1 | | 15 | 4 | | 16 | 6 | | 17 | 3 |
What fraction of the people run 100m in exactly 14s?
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[2] |
A bag has 10 red balls and 10 blue balls. You take out a red ball, then a blue ball, then another ball.
What is the probability of getting red for the last ball? | |
[1] | A group of boys were timed running 100m. Here are the results:
What fraction of the boys run 100m in exactly 15s?
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[2] |
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