Flip a coin 8 times.
Each time a head comes up you win $1 and with each tail you lose $4. It costs $11 to play (paid once). How much money would you expect to make altogether? | |
[1] | Cars go by on a road, each is a different color and type.
Probability of Color
| | 0.9 | 0.1 | | orange | red | | Color |
Probability of Type
| | 1 | | wagon | sedan | | Type |
What is the probability of a car being a orange sedan? | |
[2] |
You roll 2 3-sided dice
You add the two numbers. What is the probability of getting more than 5? | |
[1] | The weather forecast says that the chances of rain are 40%. Your chance of being outside today is 50%. You flip a coin to decide whether to take your umbrella.
What is the probability of getting wet today? | |
[1] |
A bag has 9 red balls, 10 blue balls and 8 yellow balls. You take out a blue ball, then a red ball, then another ball.
What is the probability of getting red for the last ball? | |
[1] | Flip 2 coins.
What is the probability of getting a head and a tail? | |
[1] |
A group of kids were timed running 100m. Here are the results:
What fraction of the kids run 100m in more than 14s?
| |
[2] | 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:
| | 0.05 | | 0.1 | 0.15 | 0.7 | | 1 | 2 | 3 | 4 | 5 | | Number |
What is the probability of rolling a number from 3 to 4? | |
[1] |
Roll 150 6-sided dice.
How many times would you expect to get more than 2? | |
[1] | Roll 144 6-sided dice.
How many times would you expect to get anything except 1? | |
[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:
| | 0.2 | 0.25 | 0.05 | 0.5 | | 1 | 2 | 3 | 4 | 5 | | Number |
What is the probability of rolling a number that is smaller than or equal to 1? | |
[1] |
There are 40 balls in a bag. This is is the probability distribution of their color:
| | 0.5 | 0.4 | 0.1 | | yellow | orange | pink | | Color |
How many yellow balls were in the bag? | |
[1] | Roll 30 6-sided dice.
How many times would you expect to get more than 6? | |
[1] |
Cars go by on a road, each is a different color and type.
Probability of Color
| | 0.8 | 0.2 | | orange | green | | Color |
Probability of Type
| | 0.3 | 0.7 | | wagon | sedan | | Type |
What is the probability of a car being a green sedan? | |
[2] | We asked a group of girls how many Pillows they eat in a month. Here are the results:
What fraction of the girls eat exactly 2 Pillows in a month? | |
[2] |
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