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प्रश्न
Find the mean deviation about the mean for the data.
| xi | 5 | 10 | 15 | 20 | 25 |
| fi | 7 | 4 | 6 | 3 | 5 |
पर्याय
6
7.3
8
6.32
MCQ
उत्तर
6.32
Explanation:
| `bb(x_i)` | `bb(f_i)` | `bb(f_ix_i)` | `bb(|x_i - overlinex|)` | `bb(f_i|x_i - overlinex|)` |
| 5 | 7 | 35 | 9 | 63 |
| 10 | 4 | 40 | 4 | 16 |
| 15 | 6 | 90 | 1 | 6 |
| 20 | 3 | 60 | 6 | 18 |
| 25 | 5 | 125 | 11 | 55 |
| Total | 25 | 350 | 158 |
`overlinex = (sumf_ix_i)/(sumf_i)`
= `350/25`
= 14
Mean deviation from the mean
= `(sumf_i|x_i - overlinex|)/(sumf_i)`
= `158/25`
= 6.32
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