Seven balls are shaken. You win if the two blue balls end up touching. What is the probability of winning?
Six balls are shaken. You win if at least one red ball ends in a corner. What is the probability of winning?
Start with two numbers and generate a sequence where the next number is the mean of the last two numbers...
Can you work out which spinners were used to generate the frequency charts?
If you have a large supply of 3kg and 8kg weights, how many of each would you need for the average (mean) of the weights to be 6kg?
Imagine a room full of people who keep flipping coins until they get a tail. Will anyone get six heads in a row?
If everyone in your class picked a number from 1 to 225, do you think any two people would pick the same number?
Can you work out the probability of winning the Mathsland National Lottery?
Which countries have the most naturally athletic populations?
Alison and Charlie are playing a game. Charlie wants to go first so Alison lets him. Was that such a good idea?
In this follow-up to the problem Odds and Evens, we invite you to analyse a probability situation in order to find the general solution for a fair game.
How well can you estimate 10 seconds? Investigate with our timing tool.
Can you do a little mathematical detective work to figure out which number has been wiped out?
Play around with sets of five numbers and see what you can discover about different types of average...