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Simpson's Diversity Index???!

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Got a question about Student Finance? Ask the experts this week on TSR! 14-09-2014
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    Ok, I'm really struggling with this I don't know how to calculate this even if they provide me with the formula

    If anyone has done question 4 (b)(i) on the specimen paper below, could they please provide a step by step format? Thanks.

    http://www.ocr.org.uk/Data/publicati..._Unit_f212.pdf
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    formula is D= 1D = 1-(Σ(n/N)^2) (Σ means 'sum of')

    so you do

    32/196 = 0.1633
    78/196 = 0.3980
    86/196 = 0.4388

    all the others are 0 so 0/196 = 0

    then square these

    0.1633^2 = 0.02667
    0.3980^2 = 0.1584
    0.4388^2 = 0.1925

    (0^2 is 0)

    Then add these together

    0.02667+0.1584+0.1925
    =0.3776

    Then take this from 1

    1-0.3776
    =0.6554

    So the simpsons diversity index is 0.6554

    hope that helps
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    sorry i was on my brothers account without realising that was me by the way lol
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    OMG I can't even thank you enough!!! Life saver :top: Thanks a million

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