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You may also be interested in this collection of activities from the STEM Learning website, that complement the NRICH activities above.
Statistics - Stage 4
Picturing the World
Age 14 to 16
Challenge Level 
How can we make sense of national and global statistics involving very large numbers?
Which List Is Which?
Age 14 to 16
Challenge Level
Six samples were taken from two distributions but they got muddled up. Can you work out which list is which?
Box Plot Match
Age 14 to 16
Challenge Level
Match the cumulative frequency curves with their corresponding box plots.
Olympic Triathlon
Age 14 to 16
Challenge Level
Is it the fastest swimmer, the fastest runner or the fastest cyclist who wins the Olympic Triathlon?
Perception Versus Reality
Age 14 to 18
Challenge Level
Infographics are a powerful way of communicating statistical information. Can you come up with your own?
For Richer for Poorer
Age 14 to 16
Challenge Level
Charlie has moved between countries and the average income of both has increased. How can this be so?
You may also be interested in this collection of activities from the STEM Learning website, that complement the NRICH activities above.