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प्रश्न
The marks obtained by 110 students in an examination are given below:
| Marks: | 30-35 | 35-40 | 40-45 | 45-50 | 50-55 | 55-60 | 60-65 |
| Frequencу: | 14 | 16 | 28 | 23 | 18 | 8 | 3 |
Find the mean marks of the students.
बेरीज
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उत्तर
Given: The class marks are 32.5, 37.5, 42.5, 47.5, 52.5, 57.5 and 62.5.
Calculation: \[\sum f_{i}x_{i}=455+600+1190+1092.5+945+460+187.5=4930\]
Answer: \[\overline{X}=\dfrac{4930}{110}=44.81818\ldots\approx44.82\] marks.
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