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प्रश्न
The following table shows the number of students and the time they utilized daily for their studies. Find the mean time spent by students for their studies by direct method.
| Time (hrs.) | 0 - 2 | 2 - 4 | 4 - 6 | 6 - 8 | 8 - 10 |
| No. of students | 7 | 18 | 12 | 10 | 3 |
बेरीज
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उत्तर
| Time | Class mark (xi) | No. of students (fi) | xi × fi |
| 0 - 2 | 1 | 7 | 7 |
| 2 - 4 | 3 | 18 | 54 |
| 4 - 6 | 5 | 12 | 60 |
| 6 - 8 | 7 | 10 | 70 |
| 8 - 10 | 9 | 3 | 27 |
| Total | `bb(sumf_i=50)` | `bb(sumx_ixxf_i=218)` |
Mean = `(sum x_i f_i)/(sum f_i)`
= `218/50`
= `109/25`
= 4.36 hours
Hence, the mean time spent by students on their studies is 4.36 hours.
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