2025 YCKSS PRELIMS P1 Q10

2025 YCKSS PRELIMS P1 Q10

Secondary 4
5 marks

A cumulative frequency curve shows the marks of 400 pupils.

  1. Use the curve to find
    1. the interquartile range,[2]
    2. the 35th percentile.[1]
  2. One pupil is chosen at random. Find the probability that the estimated mark is between 42 and 78.[2]

Solution:

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Answer:(a)(i) \(30\) (ii) \(36\) (b) \(\dfrac{21}{40}\)

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