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प्रश्न
Find the mean of: all prime numbers upto 30
उत्तर
The all prime numbers upto 30 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29
∴Sum of these observations = 2 + 3 +5 + 7+ 11 + 13 + 17 + 19 + 23 +29 = 129
and, number of their observations = 10
∴ Required mean = `129/10 = 12.9`
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संबंधित प्रश्न
Find the mean of the following distribution by step deviation method:
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| Frequency | 10 | 6 | 8 | 12 | 5 | 9 |
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| Class | 0 – 20 | 20 – 40 | 40 – 60 | 60 – 80 | 80 – 100 | 100 – 120 |
| Frequency | 5 | f1 | 10 | f2 | 7 | 8 |
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| 50-60 | 4 |
| 60-70 | 8 |
| 70-80 | 14 |
| 80-90 | 19 |
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Draw a histrogram for the above data using a graph paper and locate the mode.
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