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    http://qualifications.pearson.com/co...e_20130304.pdf

    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..
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    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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