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प्रश्न
Find the mean of: first six even natural numbers
उत्तर
The first six even natural numbers are 1 = 2, 4, 6, 8, 10, 12
∴ Sum of these observations = 2, 4, 6, 8, 10, 12 = 42
and, number of their observations = 6
∴ Required mean = `42/6 = 7`
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संबंधित प्रश्न
The mean of the number 6, ‘y’, 7, ‘x’ and 14 is 8. Express ‘y’ in terms of ‘x’.
The following are the marks obtained by 70 boys in a class test:
| Marks | No. of boys |
| 30 – 40 | 10 |
| 40 – 50 | 12 |
| 50 – 60 | 14 |
| 60 – 70 | 12 |
| 70 – 80 | 9 |
| 80 – 90 | 7 |
| 90 – 100 | 6 |
Calculate the mean by:
Short-cut method
For the following set of data, find the median:
10, 75, 3, 81, 17, 27, 4, 48, 12, 47, 9 and 15.
Find the mean of the following frequency distribution by the step deviation method :
| Class | 100-110 | 110-120 | 120-130 | 130-140 | 140-150 |
| Frequency | 15 | 18 | 32 | 25 | 10 |
Find the mode of the following:
3, 4, 5, 7, 6, 3, 5, 4, 3, 5, 6, 4, 7, 5, 4, 5, 4, 3, 4, 5, 7, 6, 5, 6, 6, 7
The mean of a certain number of observations is 32. Find the resulting mean, if the observation is, divided by 0.5
Find the mean of: 12, 9, 6,11 and 17
The mean of 18, 28, x, 32, 14 and 36 is 23. Find the value of x. Sum of data
Find the median of the data: 24, 36, 46, 17, 18, 25, 35
If the median of a, 2a, 4a, 6a, 9a is 8, then find the value of a is
