Hi,
Please help me solve this question.
Thank you so much.
The cumulative frequency table below shows the length of time that 30 students spent text messaging on a weekend.
| Minutes Used |
Cumulative Frequency |
| 31-40 |
2 |
| 31-50 |
5 |
| 31-60 |
10 |
| 31-70 |
19 |
| 31-80 |
30 |
Which 10-minute interval contains the first quartile?
(1) 31–40
(2) 41–50
(3) 51–60
(4) 61–70
