Question
The partially completed histogram shows the time (minutes) students spent on homework.
| Time (t) | Frequency |
|---|---|
| 0 ≤ t < 20 | 40 |
| 20 ≤ t < 30 | 35 |
| 30 ≤ t < 50 | 60 |
| 50 ≤ t < 60 | 25 |
(a) Calculate the frequency density for each class. (2 marks) (b) The bar for 20 ≤ t < 30 has been drawn with frequency density 3.5. Verify this is correct. (1 mark) (c) How many students spent more than 30 minutes on homework? (1 mark)
4 marks · take your time before peeking.
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Generated by TopMyGrade AI · cross-check official sources before relying on the mark-scheme phrasing.