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Quartiles question

Hi, when working out, say, the upper quartile, which you calculate to be the 11.25th value, do I round down and put the 11th value of the data or round up and put the 12th value of the data?

My teacher once said you should always round up your answer but I cant remember whether that is for quartiles or not


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Original post by jessyjellytot14
Hi, when working out, say, the upper quartile, which you calculate to be the 11.25th value, do I round down and put the 11th value of the data or round up and put the 12th value of the data?

My teacher once said you should always round up your answer but I cant remember whether that is for quartiles or not


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Unfortunately there is more than one method of calculating the quartiles.

Two different methods I tried both give the 12th value - I presume there are 15 in total.

Best to check back with your teacher, or in the textbook you're using for their methodology.
Original post by ghostwalker
Unfortunately there is more than one method of calculating the quartiles.

Two different methods I tried both give the 12th value - I presume there are 45 in total.

Best to check back with your teacher, or in the textbook you're using for their methodology.


Slight understatement there. See Mr M's post here: http://www.thestudentroom.co.uk/showthread.php?p=31269507
Original post by BuryMathsTutor
Slight understatement there. See Mr M's post here: http://www.thestudentroom.co.uk/showthread.php?p=31269507


Love how Excel gives the most optimistic IQR.

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