The Hidden Range
The Hidden Range
Note: Lower bound uses ≤ (could be exactly this), Upper bound uses < (never reaches this)
Now try it yourself
Quiz · Question 1 of 14
A length is 240 cm to the nearest 10 cm. What is the lower bound of the length?
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This topic in real past papers
Every real exam question we've found on bounds & error intervals, with a full worked answer.
AQA Paper 2
All four sittings we have full papers for test bounds or error intervals, and every version requires choosing the correct combination of upper and lower bounds for the specific operation involved.
AQA Paper 3
Two of the four sittings we have full papers for require bounds or an error interval to be worked out from values given to a stated accuracy.
Edexcel Paper 2
All three sittings we have full papers for test the error interval for a rounded value, and each sitting uses a slightly different rounding context, from a calculator display to the nearest whole number to 1 decimal place.