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Maths Edexcel GCSE help

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    I guessed the answer for question Q24. and answer is 0.229 but i don't understand the 'why?' part. The mark scheme says because both the U.B and L.B agree with it but it still didn't make any sense to me..

    OK. SO for this question you work out the upper and lower bounds for both the numbers. Then to find the highest possible answer you do the upper bound/lower bound and for lowest answer lower bound/upper bound. After you have got these two numbers you add them together and divide by 2 to find the average and the answer comes out as 0.229.

    Hope that helps
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