Measures of spread

  • Half a minute
    problem

    Half a minute

    Age
    11 to 14
    Challenge level
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    Anna, Ben and Charlie have been estimating 30 seconds. Who is the best?

  • About Average
    problem

    About average

    Age
    11 to 14
    Challenge level
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    Can you find sets of numbers which satisfy each of our mean, median, mode and range conditions?

  • May the best person win
    article

    May the best person win

    How can people be divided into groups fairly for events in the Paralympics, for school sports days, or for subject sets?
  • David and Goliath
    problem

    David and Goliath

    Age
    14 to 18
    Challenge level
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    Does weight confer an advantage to shot putters?

  • problem

    How would you score it?

    Age
    11 to 14
    Challenge level
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    Invent a scoring system for a 'guess the weight' competition.

  • Maximum Scattering
    problem

    Maximum scattering

    Age
    16 to 18
    Challenge level
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    Your data is a set of positive numbers. What is the maximum value that the standard deviation can take?
  • Spread
    problem

    Spread

    Age
    16 to 18
    Challenge level
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    Given the mean and standard deviation of a set of marks, what is the greatest number of candidates who could have scored 100%?

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