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    can someone explain why they ignored to use the stems in this stem and leaf diagram when working out the mean and standard deviation please.

    question 1 part ii : http://www.mei.org.uk/files/papers/S1_Paper_Jan13.pdf

    mark scheme at the bottom

    UPDATE: HELP IS NOT REQUIRED ANYMORE AS THE REASON IS BECAUSE I FAILED TO NOTICE THE KEY.
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    Zacken
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