Percentile Rank

Discussion in 'Community Discussion' started by waloshin, May 1, 2009.

  1. waloshin macrumors 68040

    waloshin

    Joined:
    Oct 9, 2008
    #1
    Me and some friends have tried to figure this out , but didnt get it.

    [​IMG]

    For question 11 Digging Deeper:

    b) Determine the percentile rank of the students whose marks were 84.

    What we did was:

    PR= 1[100(27-3)]
    Over
    27-1

    The answer we got was 2400/ 26 = 92.30

    The answer book says: 89
     
  2. rhsgolfer33 macrumors 6502a

    Joined:
    Jan 6, 2006
    #2
    (100*(27-4)) / (27-1) = 88.46 + 1 = 89.46 so about 89.

    Simple mistake, the rank of someone with an 84 is 4 not 3.
     
  3. waloshin thread starter macrumors 68040

    waloshin

    Joined:
    Oct 9, 2008
    #3
    Thank you very much, I always make little mistakes like that!
     

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