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Edexcel S1 clarification

Discussion in 'Mathematics' started by retired65, Feb 12, 2012.

  1. I an due to tutor a student on S1.
    Can anyone confirm Edexcels generally accepted method of finding the median/quartiles from grouped and ungrouped data? (as the range of materials vary hugely in their approach)
    The <u>general</u> approach seems from grouped simply divide by 2 for the median and 4 for q1
    The general approach for ungrouped is divide by 4 and round up fro q1/q3 and (n+1)/2 for the median.
    Please can someone confrim the approach accepted/used for the exams.
    Thanks
     
  2. I an due to tutor a student on S1.
    Can anyone confirm Edexcels generally accepted method of finding the median/quartiles from grouped and ungrouped data? (as the range of materials vary hugely in their approach)
    The <u>general</u> approach seems from grouped simply divide by 2 for the median and 4 for q1
    The general approach for ungrouped is divide by 4 and round up fro q1/q3 and (n+1)/2 for the median.
    Please can someone confrim the approach accepted/used for the exams.
    Thanks
     
  3. Round up for discrete and use the exact value for continuous data.
    These follows through nicely for interpolation. I find that if students can do the soloman papers they are fine with the actual edexcel.
    Good luck
     
  4. *this follows*
     
  5. adamcreen

    adamcreen Occasional commenter

    For ungrouped: there will either be 4n-1 numbers in the list or 4n numbers in the list.

    For 4n-1, e.g. 11 numbers: use 3rd, 6th and 9th

    For 4n, e.g. 12 numbers: use midway between 3rd and 4th, 6th and 7th, and 9th and 10th
     

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