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प्रश्न
Find the mean of the natural numbers from 3 to 12.
उत्तर
Numbers between 3 to 12 are 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12.
Here n = 10
`barx = (x_1 + x_2 + .... + x_n)/n`
∴ `barx = (3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12)/10`
= `75/10`
= 7.5
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संबंधित प्रश्न
Calculate the mean of the following distribution using step deviation method.
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| Number of students |
10 | 9 | 25 | 0 | 16 | 10 |
The distribution given below shows the marks obtained by 25 students in an aptitude test. Find the mean, median and mode of the distribution.
| Marks obtained | 5 | 6 | 7 | 8 | 9 | 10 |
| No. of students | 3 | 9 | 6 | 4 | 2 | 1 |
Draw an ogive for the data given below and from the graph determine:
- the median marks
- the number of students who obtained more than 75% marks
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| 0 – 9 | 5 |
| 10 – 19 | 9 |
| 20 – 29 | 16 |
| 30 – 39 | 22 |
| 40 – 49 | 26 |
| 50 – 59 | 18 |
| 60 – 69 | 11 |
| 70 – 79 | 6 |
| 80 – 89 | 4 |
| 90 – 99 | 3 |
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| Date July | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Num | 5 | 12 | 20 | 27 | 46 | 30 | 31 | 18 | 11 | 5 | 0 | 1 |
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63, 17, 50, 9, 25, 43, 21, 50, 14 and 34
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The marks in a subject for 12 students are as follows:
31, 37, 35, 38, 42, 23, 17, 18, 35, 25, 35, 29
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