| You shoot an arrow at a target. You will either score 20 (10% chance), 40 (40% chance), or 50. What average score do you expect to get if you do this many times? | |
[1] | You roll 2 3-sided dice
You add the two numbers. What is the probability of getting less than 6? | |
[1] |
The weather forecast says that the chances of rain are 80%. Your chance of being outside today is 80%. The chance of remembering your umbrella is 60%.
What is the probability of getting wet today? | |
[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 | 0.05 | 0.25 | 0.15 | 0.25 | | 1 | 2 | 3 | 4 | 5 | | Number |
What is the probability of rolling a number that is bigger than 4 or smaller than 5? | |
[1] |
Roll 1 6-sided die.
What is the probability of getting an odd number? | |
[1] | Flip a coin 6 times.
Each time a Head comes up you win $3. How much money would you expect to make altogether? | |
[1] |
Flip a coin 4 times.
Each time a Tail comes up you win $2. It costs $7 to play (paid once). How much money would you expect to make altogether? | |
[1] | Roll 42 6-sided dice.
How many times would you expect to get anything except 6? | |
[1] |
A bag has 8 balls with numbers from 2 to 9. You take out 1 ball.
What is the probability of NOT getting the ball with the number 10? | |
[1] | Roll 1 6-sided die.
What is the probability of NOT getting a 3? | |
[1] |
There are 60 balls in a bag. This is is the probability distribution of their color:
If you choose a random ball from the bag, what is the probability of it not being yellow? | |
[1] | Flip a coin 4 times.
Each time a head comes up you win $1 and with each tail you lose $3. It costs $1 to play (paid once). How much money would you expect to make altogether? | |
[1] |
You roll 2 3-sided dice
You add the two numbers. What is the probability of getting less than 4? | |
[1] | Roll 1 6-sided die.
What is the probability of getting a 6? | |
[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 0? | |
[2] | Roll 18 6-sided dice.
How many times would you expect to get less than 6? | |
[1] |
Cars go by on a road, each is a different color and type.
Probability of Color
| | 0.9 | 0.1 | | red | blue | | Color |
Probability of Type
| | 0.5 | 0.5 | | sedan | wagon | | Type |
What is the probability of a car being a red wagon? | |
[2] | A bag has 2 red balls, 3 blue balls and 2 yellow balls. You take out a yellow ball, then a red ball, then another ball.
What is the probability of getting yellow for the last ball? | |
[1] |
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