2026 CSS P1 Q24

2026 CSS P1 Q24

Secondary 4
4 marks

The box and whisker plot shows the weight distribution of 40 students.

  1. How many students weigh at most 48kg?[2]
  2. It was found that the weighing scale is faulty.
    It overweighs by one kilogram.
    Explain what will happen to the median and the interquartile range after the reading is corrected.[2]

Solution:

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Answer:(a) \(10\) students (b) Median decreases by \(1\text{ kg}\) to \(51\text{ kg}\); IQR is unchanged at \(15\text{ kg}\).

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