# Resources tagged with: Conditional probability

### There are 16 results

Broad Topics >

Probability > Conditional probability

##### Age 11 to 14

Challenge Level

Alison and Charlie are playing a game. Charlie wants to go first so Alison lets him. Was that such a good idea?

##### Age 11 to 14

Challenge Level

Imagine flipping a coin a number of times. Can you work out the probability you will get a head on at least one of the flips?

##### Age 14 to 16

Challenge Level

Can you work out the probability of winning the Mathsland National Lottery?

##### Age 14 to 16

Challenge Level

If everyone in your class picked a number from 1 to 225, do you think any two people would pick the same number?

##### Age 14 to 16

Challenge Level

The next ten people coming into a store will be asked their
birthday. If the prize is £20, would you bet £1 that two
of these ten people will have the same birthday ?

##### Age 11 to 14

Challenge Level

Seven balls are shaken. You win if the two blue balls end up touching. What is the probability of winning?

##### 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 14 to 18

Challenge Level

How can we find out answers to questions like this if people often lie?

##### Age 14 to 16 Short

Challenge Level

What percentage of students who graduate have never been to France?

##### Age 14 to 16 Short

Challenge Level

How can this prisoner escape?

##### Age 14 to 16

Challenge Level

"Statins cut the risks of heart attacks and strokes by 40%"

Should the Professor take statins? Can you help him decide?

##### Age 11 to 16

Challenge Level

Newspapers said that eating a bacon sandwich every day raises the risk of bowel cancer by 20%. Should you be concerned?

##### Age 11 to 14

Challenge Level

Your partner chooses two beads and places them side by side behind a screen. What is the minimum number of guesses you would need to be sure of guessing the two beads and their positions?

##### Age 14 to 16

Challenge Level

In how many different ways can I colour the five edges of a pentagon so that no two adjacent edges are the same colour?

##### Age 14 to 16

Challenge Level

You have two bags, four red balls and four white balls. You must
put all the balls in the bags although you are allowed to have one
bag empty. How should you distribute the balls between the two bags
so as to make the probability of choosing a red ball as small as
possible and what will the probability be in that case?

##### Age 14 to 16

Challenge Level

You and I play a game involving successive throws of a fair coin.
Suppose I pick HH and you pick TH. The coin is thrown repeatedly
until we see either two heads in a row (I win) or a tail followed
by a head (you win). What is the probability that you win?