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Sally used her calculator to work out the value of a number $y$ - Edexcel - GCSE Maths - Question 7 - 2019 - Paper 2

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Sally used her calculator to work out the value of a number $y$. The answer on her calculator display began 8.3 Complete the error interval for $y$.

Worked Solution & Example Answer:Sally used her calculator to work out the value of a number $y$ - Edexcel - GCSE Maths - Question 7 - 2019 - Paper 2

Step 1

Complete the error interval for $y$.

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Answer

Since the calculator displays began with 8.3, the number yy must be at least 8.3 but less than 8.4, since the next digit in the display could affect the rounding.

Thus, we can express the error interval for yy as:

8.3leqy<8.48.3 leq y < 8.4

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