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प्रश्न
Consider the following distribution:
| Marks obtained | Number of students |
| More than or equal to 0 | 63 |
| More than or equal to 10 | 58 |
| More than or equal to 20 | 55 |
| More than or equal to 30 | 51 |
| More than or equal to 40 | 48 |
| More than or equal to 50 | 42 |
The frequency of the class 30 – 40 is:
विकल्प
3
4
48
51
उत्तर
3
Explanation:
| Marks obtained | Number of students |
| 0 – 10 | (63 – 58) = 5 |
| 10 – 20 | (58 – 55) = 3 |
| 20 – 30 | (55 – 51) = 4 |
| 30 – 40 | (51 – 48) = 3 |
| 40 – 50 | (48 – 42) = 6 |
| 50... | 42 = 42 |
Hence, frequency of the class interval 30 – 40 is 3.
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| Class: | 0-5 | 6-11 | 12-17 | 18-23 | 24-29 |
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The following table shows the cumulative frequency distribution of marks of 800 students in an examination:
| Marks | Number of students |
| Below 10 | 10 |
| Below 20 | 50 |
| Below 30 | 130 |
| Below 40 | 270 |
| Below 50 | 440 |
| Below 60 | 570 |
| Below 70 | 670 |
| Below 80 | 740 |
| Below 90 | 780 |
| Below 100 | 800 |
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Find the unknown entries a, b, c, d, e, f in the following distribution of heights of students in a class:
| Height (in cm) |
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| 150 – 155 | 12 | a |
| 155 – 160 | b | 25 |
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| 165 – 170 | d | 43 |
| 170 – 175 | e | 48 |
| 175 – 180 | 2 | f |
| Total | 50 |
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| Marks | Below 20 | Below 40 | Below 60 | Below 80 | Below 100 |
| Number of students | 17 | 22 | 29 | 37 | 50 |
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