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### Number and algebra

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# Being Resilient - Statistics

### In a Box

### Substitution Cipher

### M, M and M

### WipeoutLive

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Age 14 to 16

Challenge Level

Chris and Jo put two red and four blue ribbons in a box. They each pick a ribbon from the box without looking. Jo wins if the two ribbons are the same colour. Is the game fair?

Age 11 to 14

Challenge Level

Find the frequency distribution for ordinary English, and use it to help you crack the code.

Age 11 to 14

Challenge Level

If you are given the mean, median and mode of five positive whole numbers, can you find the numbers?

Age 11 to 16

Challenge Level

Can you do a little mathematical detective work to figure out which number has been wiped out?