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प्रश्न
Organise the following marks in a class assessment, in a tabular form.
4, 6, 7, 5, 3, 5, 4, 5, 2, 6, 2, 5, 1, 9, 6, 5, 8, 4, 6, 7
- Which number is the highest?
- Which number is the lowest?
- What is the range of the data?
- Find the arithmetic mean.
उत्तर
| Marks | Tally marks | Frequency |
| 1 | I | 1 |
| 2 | II | 2 |
| 3 | I | 1 |
| 4 | III | 3 |
| 5 | `cancel(bb|bb|bb|bb|)` | 5 |
| 6 | III | 4 |
| 7 | II | 2 |
| 8 | I | 1 |
| 9 | I | 1 |
i. Highest number = 9
ii. Lowest number = 1
iii. Range = (9 − 1) = 8
iv. Sum of all the observations = 4 + 6 + 7 + 5 + 3 + 5 + 4 + 5 + 2 + 6 + 2 + 5 + 1 + 9 + 6 + 5 + 8 + 4 + 6 + 7
= 100
Total number of observations = 20
Arithmetic mean = `"Sum of all the observations"/"Total number of the observations"`
= `100/20`
= 5
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|
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