A bag has 2 red balls and 8 blue balls. You take out a red ball, then a red ball, then another ball.
What is the probability of getting blue for the last ball? | |
[1] | | You shoot an arrow at a target. There is a 60% chance of scoring a 20, a 10% chance of scoring a 50, or you might miss completely and score 0. What average score do you expect to get if you do this many times? | |
[1] |
The weather forecast says that the chances of rain are 80%. Your chance of being outside today is 90%. The chance of remembering your umbrella is 60%.
What is the probability of getting wet today? | |
[1] | | You shoot an arrow at a target. You will either score 10 (40% chance), 30 (20% chance), or 50. What average score do you expect to get if you do this many times? | |
[1] |
You flip a coin and roll a 8 sided die.
What is the probability of getting a 2 and a head? | |
[1] | A wheel has 12 sections, each a number on it from 1 to 12. If you spin an odd number you win that amount of dollars, if you spin an even number you lose.
What prize do we expect to get if we spin the wheel? | |
[1] |
Roll 108 6-sided dice.
How many times would you expect to get an ugly number? | |
[1] | A group of girls did a math test and here are their scores out of 5:
What fraction of the girls score more than 2? | |
[2] |
Cars go by on a road, each is a different color and type.
Probability of Color
| | 0.9 | 0.1 | | pink | orange | | Color |
Probability of Type
| | 0.3 | 0.7 | | sedan | wagon | | Type |
What is the probability of a car being a pink wagon? | |
[2] | A group of kids did a math test and here are their scores out of 5:
What fraction of the kids score more than 4? | |
[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:
| | 0.55 | 0.15 | 0.1 | 0.1 | 0.1 | | 1 | 2 | 3 | 4 | 5 | | Number |
What is the probability of rolling a number that is bigger than 4 and smaller than 1? | |
[1] | You roll 2 3-sided dice
You add the two numbers. What is the probability of getting less than or equal to 4? | |
[1] |
The weather forecast says that the chances of rain are 40%. The chance of remembering your umbrella is 70%. Your chance of being outside today are 90%.
What is the probability of getting wet today? | |
[1] | Flip a coin 8 times.
Each time a head comes up you win $4 and with each tail you lose $1. It costs $3 to play (paid once). How much money would you expect to make altogether? | |
[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:
| | 0.55 | 0.1 | 0.05 | 0.25 | 0.05 | | 1 | 2 | 3 | 4 | 5 | | Number |
What is the probability of rolling a number that is smaller than or equal to 1? | |
[1] | A wheel has 5 red sections and 4 yellow sections.
What is the probability of getting yellow? | |
[1] |
There are 30 balls in a bag. This is is the probability distribution of their color:
| | 0.6 | | 0.4 | | yellow | blue | green | | Color |
If you choose a random ball from the bag, what is the probability of it not being green or yellow? | |
[1] |