A bag has 2 red balls and 10 blue balls. You take out a blue ball, then a red ball, then another ball.
What is the probability of getting blue for the last ball? | |
[1] | Roll 30 6-sided dice.
How many times would you expect to get anything except 6? | |
[1] |
A group of humans were timed running 100m. Here are the results:
humans
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| Time | 13 | 2 | | 14 | 5 | | 15 | 6 | | 16 | 3 | | 17 | 4 |
What is the probability of the humans to run 100m in exactly 13s?
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[2] | Roll 150 6-sided dice.
How many times would you expect to get a number more than 4? | |
[1] |
Flip 2 coins.
What is the probability of getting 2 tails? | |
[1] | There are 30 balls in a bag. This is is the probability distribution of their color:
| | 0.3 | | 0.7 | | green | red | orange | | Color |
If you choose a random ball from the bag, what is the probability of it not being red or orange? | |
[1] |
A group of dogs were timed running 100m. Here are the results:
What is the probability of the dogs to run 100m in more than 15s?
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[2] | A bag has 5 balls with numbers from 4 to 8. You take out 1 ball.
What is the probability of NOT getting the ball with the number 8? | |
[1] |
You roll 2 3-sided dice
You add the two numbers. What is the probability of getting less than 3? | |
[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:
| | 0.4 | 0.05 | 0.05 | 0.25 | 0.25 | | 1 | 2 | 3 | 4 | 5 | | Number |
What is the probability of rolling a number from 3 to 4? | |
[1] |
There are 8 balls in a bag. This is is the probability distribution of their color:
How many purple balls were in the bag? | |
[1] | You flip a coin and roll a 6 sided die.
What is the probability of getting a number equal to 2 and a tail? | |
[1] |
Flip a coin 16 times.
Each time a Tail comes up you win $4. It costs $20 to play (paid once). How much money would you expect to make altogether? | |
[1] | A group of dogs were timed running 100m. Here are the results:
What fraction of the dogs run 100m in exactly 17s?
| |
[2] |
A wheel has 8 sections, each has a reward in dollars, from $1 through to $8.
What prize do we expect to get if we spin the wheel? | |
[1] | You flip a coin and roll a 9 sided die.
What is the probability of getting a 6 and a head? | |
[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:
| | 0.75 | | 0.1 | 0.05 | 0.1 | | 1 | 2 | 3 | 4 | 5 | | Number |
What is the probability of rolling a number that is bigger than or equal to 1? | |
[1] |