Interpreting a height stem-and-leaf
Interpreting a height stem-and-leaf
Secondary 2
3 marks
TGM Original Questions
Give percentages correct to 3 significant figures where necessary.
For the probability calculation, each student in the stated group is equally likely to be selected.
The heights of 15 students are shown.
| Stem | Leaf |
|---|---|
| \(12\) | \(8\) |
| \(13\) | \(2\) \(7\) |
| \(14\) | \(1\) \(3\) \(5\) \(8\) |
| \(15\) | \(0\) \(4\) \(6\) \(9\) |
| \(16\) | \(2\) \(7\) |
| \(17\) | \(3\) \(3\) |
Key: \(12|8=128\) cm. Find
- the range,[1]
- the percentage below 145 cm,[1]
- the probability that a selected height is between 140 cm and 165 cm inclusive.[1]
Solution:
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Answer:(a) \(45\) cm (b) \(33.3\%\) (c) \(\frac{3}{5}\).
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