Speed-distribution histogram and probability
Speed-distribution histogram and probability
Secondary 2
6 marks
TGM Original Questions
For the probability calculation, each vehicle in the stated group is equally likely to be selected.
Sixty vehicle speeds are grouped.
| Speed \(x\) km/h | Frequency |
|---|---|
| \(40<x\le50\) | \(5\) |
| \(50<x\le60\) | \(11\) |
| \(60<x\le70\) | \(18\) |
| \(70<x\le80\) | \(13\) |
| \(80<x\le90\) | \(8\) |
| \(90<x\le100\) | \(5\) |
- Draw a histogram.[3]
- State the modal class.[1]
- Find the probability that a selected vehicle travels within a 70 km/h limit.[2]
Solution:
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Answer:(a) frequency bars as table (b) \(60<x\le70\) (c) \(\frac{17}{30}\).
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