Probability

There are 130 NRICH Mathematical resources connected to Probability
Very old man
problem
Favourite

Very old man

Age
16 to 18
Challenge level
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Is the age of this very old man statistically believable?
What does random look like?
problem
Favourite

What does random look like?

Age
11 to 14
Challenge level
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Engage in a little mathematical detective work to see if you can spot the fakes.
FA Cup
problem
Favourite

Fa cup

Age
16 to 18
Challenge level
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In four years 2001 to 2004 Arsenal have been drawn against Chelsea in the FA cup and have beaten Chelsea every time. What was the probability of this? Lots of fractions in the calculations!
Connect Three
problem
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Connect three

Age
11 to 16
Challenge level
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In this game the winner is the first to complete a row of three. Are some squares easier to land on than others?
At least one...
problem
Favourite

At least one...

Age
11 to 14
Challenge level
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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?

Scale invariance
problem
Favourite

Scale invariance

Age
16 to 18
Challenge level
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By exploring the concept of scale invariance, find the probability that a random piece of real data begins with a 1.
The Twelve Pointed Star Game
problem
Favourite

The twelve pointed star game

Age
7 to 11
Challenge level
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Have a go at this game which involves throwing two dice and adding their totals. Where should you place your counters to be more likely to win?
Roll these Dice
problem
Favourite

Roll these dice

Age
7 to 11
Challenge level
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Roll two red dice and a green dice. Add the two numbers on the red dice and take away the number on the green. What are all the different possible answers?

In a box
problem
Favourite

In a box

Age
14 to 16
Challenge level
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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?
Rain or Shine
problem
Favourite

Rain or shine

Age
16 to 18
Challenge level
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Predict future weather using the probability that tomorrow is wet given today is wet and the probability that tomorrow is wet given that today is dry.