2025 AHS PRELIMS P1 Q12

2025 AHS PRELIMS P1 Q12

Secondary 4
5 marks

The test scores for a group of 24 students were recorded.

Key: \(7\mid0\) means 70 marks.
StemLeaf
\(0\)\(9\)
\(1\)
\(2\)\(1\quad 3\)
\(3\)\(1\quad 3\quad 4\quad 7\quad 7\quad 7\quad 8\)
\(4\)\(2\quad 5\quad 7\quad 9\)
\(5\)\(5\quad 6\quad 7\quad 7\quad 9\quad 9\)
\(6\)
\(7\)\(0\quad 7\quad 8\quad 8\)

The results are shown in the stem-and-leaf diagram.

  1. Find the interquartile range.[2]
  2. Find the median result.[1]
  3. Find the mode result.[1]
  4. 15 students did not achieve a merit grade. Find the minimum score to achieve merit grade.[1]

Solution:

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Answer:(i) \(22.5\) (ii) \(46\) (iii) \(37\) (iv) \(56\)

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