2026 NASS P1 Q21

2026 NASS P1 Q21

Secondary 4
4 marks

The cumulative frequency diagram represents the marks scored by a group of 120 students for a Physics Weighted Assessment.

  1. Use the diagram to find the interquartile range of the marks scored.[2]
  2. One of these students is chosen at random.
    The probability that the student’s mark is greater than \(t\) marks is \(\dfrac5{12}\).
    Find the value of \(t\).[2]

Solution:

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Answer:(a) 28 marks. (b) \(t\approx50\).

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