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प्रश्न
Find the mean of first 10 prime numbers and first 10 composite numbers
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उत्तर
First 10 prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29
Mean = `"Sum of all data"/"Number of data"`
= `(2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29)/10`
= `129/10`
Mean = 12.9
Mean of first 10 prime numbers = 12.9
First 10 composite numbers are 4, 6, 8, 9, 10, 12, 14, 15, 16, 18
Mean = `(4 + 6 + 8 + 9 + 10 + 12 + 14 + 15 + 16 + 18)/10`
= `112/10`
= 11.2
Mean of first 10 composite numbers = 11.2
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संबंधित प्रश्न
The mean is one of the numbers in a data.
The data 6, 4, 3, 8, 9, 12, 13, 9 has mean 9.
The following table shows the number of saplings planted by 30 students. Fill in the boxes and find the average number of saplings planted by each student.
| No. of saplings (Scores) xi |
No. of students (frequency) fi |
fi x xi |
| 1 | 4 | 4 |
| 2 | 6 | `square` |
| 3 | 12 | `square` |
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