| A bag has 2 balls with number 7 and 5 balls with a number 4. What will be the average of the numbers of the balls taken out of the bag | |
[1] | There are 20 balls in a bag. This is is the probability distribution of their color:
| | 0.3 | 0.4 | 0.3 | | orange | purple | pink | | Color |
How many pink balls were in the bag? | |
[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:
| | 0.05 | 0.15 | | 0.2 | 0.6 | | 1 | 2 | 3 | 4 | 5 | | Number |
What is the probability of rolling a number from 4 to 5? | |
[1] | Roll 2 6-sided dice.
What is the probability of getting 2 numbers that are even? | |
[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:
| | 0.45 | | 0.25 | 0.05 | 0.25 | | 1 | 2 | 3 | 4 | 5 | | Number |
What is the probability of rolling a number that is bigger than 3? | |
[1] | Cars go by on a road, each is a different color and type.
Probability of Color
| | 0.8 | 0.2 | | purple | orange | | Color |
Probability of Type
| | 0.3 | 0.7 | | sedan | wagon | | Type |
What is the probability of a car being a purple wagon? | |
[2] |
A bag has 5 red balls and 10 blue balls. You take out a red ball, then a red ball, then another ball.
What is the probability of getting red for the last ball? | |
[1] | Cars go by on a road, each is a different color and type.
Probability of Color
| | 0.1 | 0.9 | | pink | yellow | | Color |
Probability of Type
| | 0.4 | 0.6 | | sedan | wagon | | Type |
What is the probability of a car being a yellow sedan? | |
[2] |
Flip a coin 2 times.
Each time a head comes up you win $3 and with each tail you lose $3. It costs $2 to play (paid once). How much money would you expect to make altogether? | |
[1] | | You shoot an arrow at a target. There is a 60% chance of scoring a 20, a 30% chance of scoring a 40, or you might miss completely and score 0. What average score do you expect to get if you do this many times? | |
[1] |
Roll 30 6-sided dice.
How many times would you expect to get less than or equal to 4? | |
[1] | We asked a group of boys how many Oranges they eat in a week. Here are the results:
What fraction of the boys eat less than 4 Oranges in a week? | |
[2] |
A group of dogs were timed running 100m. Here are the results:
What fraction of the dogs run 100m in less than 17s?
| |
[2] | A bag has 6 red balls, 6 green balls and 8 blue balls. You take out 1 ball.
What is the probability of getting a green ball or a blue ball? | |
[1] |
Cars go by on a road, each is a different color and type.
Probability of Color
| | 0.9 | 0.1 | | red | orange | | Color |
Probability of Type
| | 0.2 | 0.8 | | wagon | sedan | | Type |
What is the probability of a car being a orange wagon? | |
[2] |