Statistics: Stem-and-Leaf Diagram and Percentage Calculation
Statistics: Stem-and-Leaf Diagram and Percentage Calculation
Secondary 2
The percentage marks obtained by student in a class test are recorded in the table below.
\(35\) | \(58\) | \(85\) | \(45\) | \(63\) |
|---|---|---|---|---|
\(65\) | \(75\) | \(48\) | \(29\) | \(38\) |
\(59\) | \(67\) | \(69\) | \(68\) | \(55\) |
\(90\) | \(81\) | \(78\) | \(74\) | \(70\) |
\(58\) | \(70\) | \(62\) | \(72\) | \(71\) |
- Represent the above data in a stem-and-leaf diagram.
- Find the percentage of students who have a mass of at most \(70\) marks.
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Answer:(i) Stem-and-leaf rows: \(2\mid9\), \(3\mid5\,8\), \(4\mid5\,8\), \(5\mid5\,8\,8\,9\), \(6\mid2\,3\,5\,7\,8\,9\), \(7\mid0\,0\,1\,2\,4\,5\,8\), \(8\mid1\,5\), \(9\mid0\). Key: \(7\mid0=70\) marks. (ii) \(68\%\).
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