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Question
The weights (in kg) of 30 students of a class are:
39, 38, 36, 38, 40, 42, 43, 44, 33, 33, 31, 45, 46, 38, 37, 31, 30, 39, 41, 41, 46, 36, 35, 34, 39, 43, 32, 37, 29, 26.
Prepare a frequency distribution table using one class interval as (30 – 35), 35 not included.
- Which class has the least frequency?
- Which class has the maximum frequency?
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Solution
| Class interval | Tally marks | Frequency |
| 25 – 30 | `bb|bb|` | 2 |
| 30 – 35 | `\cancel(bb|bb|bb|bb|) bb|bb|` | 7 |
| 35 – 40 | `\cancel(bb|bb|bb|bb|) \cancel(bb|bb|bb|bb|) bb|` | 11 |
| 40 – 45 | `\cancel(bb|bb|bb|bb|) bb|bb|` | 7 |
| 45 – 50 | `bb|bb|bb|` | 3 |
| Total | 30 |
- The class interval 25 – 30 has the least frequency, i.e. 2.
- The class interval 35 – 40 has the maximum frequency, i.e. 11.
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RELATED QUESTIONS
Find the class-mark of the class 35 - 40.
If the classes are 0-10, 10-20, 20-30... then in which class should the observation 10 be included?
Construct a frequency distribution table from the following cumulative frequency distribution:
| Class Interval | Cumulative Frequency |
| 10 - 19 | 8 |
| 20 - 29 | 19 |
| 30- 39 | 23 |
| 40- 49 | 30 |
Size of the class 150 – 175 is ______.
In the class interval 26 – 33, 33 is known as ______.
The number of times a particular observation occurs in a given data is called its ______.
In the class intervals 10 – 20, 20 – 30, etc., respectively, 20 lies in the class ______.
Using the following frequency table.
| Marks (obtained out of 10) | 4 | 5 | 7 | 8 | 9 | 10 |
| Frequency | 5 | 10 | 8 | 6 | 12 | 9 |
The frequency of less than 8 marks is 29.
Using the following frequency table.
| Marks (obtained out of 10) | 4 | 5 | 7 | 8 | 9 | 10 |
| Frequency | 5 | 10 | 8 | 6 | 12 | 9 |
10 marks the highest frequency.
The class size of the class interval 60 – 68 is 8.
