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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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If class mark is 10 and class width is 6 then find the class.
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Construct a frequency table from the following data:
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| less than 20 | 15 |
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| less than 50 | 53 |
| less than 60 | 70 |
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| 10 - 19 | 8 |
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| 30- 39 | 23 |
| 40- 49 | 30 |
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| 5 - 10 | 18 |
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| 15 - 20 | 46 |
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