Flip a coin 2 times.
Each time a head comes up you win $2 and with each tail you lose $2. It costs $2 to play (paid once). How much money would you expect to make altogether? | |
[1] | There are 10 balls in a bag. This is is the probability distribution of their color:
| | 0.1 | 0.3 | 0.6 | | orange | yellow | blue | | Color |
If you choose a random ball from the bag, what is the probability of it being blue? | |
[1] |
Roll 30 6-sided dice.
How many times would you expect to get less than or equal to 5? | |
[1] | Flip a coin 18 times.
Each time a Head comes up you win $1. It costs $18 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
| | 0.3 | 0.7 | | yellow | green | | Color |
Probability of Type
| | 0.2 | 0.8 | | sedan | wagon | | Type |
What is the probability of a car being a yellow sedan? | |
[2] | A bag has 5 red balls, 9 blue balls and 9 yellow balls. You take out a red ball, then a yellow ball, then another ball.
What is the probability of getting yellow for the last ball? | |
[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:
| | 0.65 | 0.15 | 0.15 | 0.05 | | | 1 | 2 | 3 | 4 | 5 | | Number |
What is the probability of rolling a number that is bigger than 3 or smaller than 4? | |
[1] | There are 30 balls in a bag. This is is the probability distribution of their color:
| | 0.3 | 0.5 | 0.2 | | red | purple | pink | | Color |
If you choose a random ball from the bag, what is the probability of it being purple or pink? | |
[1] |
A group of boys were timed running 100m. Here are the results:
What fraction of the boys run 100m in more than 17s?
| |
[2] | The weather forecast says that the chances of rain are 50%. The chance of remembering your umbrella is 60%. Your chance of being outside today are 40%.
What is the probability of getting wet today? | |
[1] |
A bag has 9 balls with numbers from 3 to 11. You take out 1 ball.
What is the probability of NOT getting a ball with a number less than 12? | |
[1] | Roll 1 6-sided die.
What is the probability of getting an even number? | |
[1] |
A group of girls did a math test and here are their scores out of 5:
What is the probability of the girls to score exactly 5? | |
[2] | A group of boys did a math test and here are their scores out of 5:
What fraction of the boys score exactly 3? | |
[2] |
We asked a group of girls how many Pillows they eat in a day. Here are the results:
What is the probability of the girls to eat exactly 3 Pillows in a day? | |
[2] |