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प्रश्न
Find the class-mark of the class 35-40.
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उत्तर
Class mark = `("Lower class limit" + "Upper class limit")/2`
Since, `(35 + 40)/2`
= `75/2`
= 37.5
So, the class mark for the class 35-40 is 37.5.
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संबंधित प्रश्न
Complete the Following Table.
| Classes (age) | Tally marks | Frequency (No. of students) |
| 12-13 | `cancel(bb|bb|bb|bb|)` | `square` |
| 13-14 | `cancel(bb|bb|bb|bb|)` `cancel(bb|bb|bb|bb|)` `bb|bb|bb|bb|` | `square` |
| 14-15 | `square` | `square` |
| 15-16 | `bb|bb|bb|bb|` | `square` |
| N = ∑f = 35 |
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| 0 -8 | 9 |
| 8 - 16 | 13 |
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| 32 - 40 | 15 |
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| Class Interval | 20 - 24 | 25 29 | 30 - 34 | 35 - 39 | 40 - 44 | 45 - 49 |
| Frequency | 6 | 12 | 10 | 15 | 9 | 2 |
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