(a)[1]
Find the mean value of the estimated heights.
(b)[1]
Find the median value of the estimated heights.
(c)[1]
Give a reason why the median is probably more appropriate than the mean as a measure of central tendency for this information.
Mathematics 9709 · AS & A Level · Representation of data
Representation of data — practice question
Twenty children were requested to estimate how tall a particular tree was. Their estimates, measured in metres, were: $4.1, 4.2, 4.4, 4.5, 4.6, 4.8, 5.0, 5.2, 5.3, 5.4, 5.5, 5.8, 6.0, 6.2, 6.3, 6.4, 6.6, 6.8, 6.9, 19.4$.
Worked solution & mark scheme
This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A correct median calculation, for example $ 123.4/20 = 6.17$ minutes.” …
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