The table shows the distribution of marks obtained by some students in a test Marks...
FURTHER MATHEMATICS
WAEC 2021
The table shows the distribution of marks obtained by some students in a test
| Marks | 0-9 | 10-19 | 20-29 | 30-39 | 40-49 |
| Frequency | 4 | 12 | 16 | 6 | 2 |
What is the upper class boundary of the upper quartile class?
- A. 49.5
- B. 39.5
- C. 29.5
- D. 19.5
Correct Answer: C. 29.5
Explanation
£f = 4 + 12 + 16 + 6 +2 = 40
Upper quartile class
= 3/4 of 40 = 30th position
Counting from the distribution table to the 30th position,
the upper class boundary is 29.5
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