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प्रश्न
Calculate the mean of the following distribution :
| Class Interval | 0-10 | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 |
| Frequency | 8 | 5 | 12 | 35 | 24 | 16 |
उत्तर
Consider the following distribution:
| Class Interval | Frequency (f) | Classmark (x) | fx |
| 0 – 10 | 8 | 5 | 40 |
| 10 – 20 | 5 | 15 | 75 |
| 20 – 30 | 12 | 25 | 300 |
| 30 – 40 | 35 | 35 | 1225 |
| 40 – 50 | 24 | 45 | 1080 |
| 50 – 60 | 16 | 55 | 880 |
| Total | `n = sum f = 100` | `sum fx = 3600` |
Mean = `(sum fx)/n = 3600/100 = 36`
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संबंधित प्रश्न
The mean of the following distribution is 52 and the frequency of class interval 30-40 is ‘f’. Find ‘f’.
| Class Interval | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 | 60-70 | 70-80 |
| Frequency | 5 | 3 | f | 7 | 2 | 6 | 13 |
Using step-deviation method, calculate the mean marks of the following distribution.
| C.I. | 50 – 55 | 55 – 60 | 60 – 65 | 65 – 70 | 70 – 75 | 75 – 80 | 80 – 85 | 85 – 90 |
| Frequency | 5 | 20 | 10 | 10 | 9 | 6 | 12 | 8 |
A boy scored following marks in various class tests during a term; each test being marked out of 20.
15, 17, 16, 7, 10, 12, 14, 16, 19, 12 and 16
What are his median marks?
The mean of the following distribution in 52 and the frequency of class interval 30-40 'f' find f
| C.I | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 | 60-70 | 70-80 |
| freq | 5 | 3 | f | 7 | 2 | 6 | 13 |
Find the median of the following:
25, 34, 31, 23, 22, 26, 35, 29, 20, 32
Find the mean of x + 3, x + 5, x + 7, x + 9 and x + 11.
The mean of a certain number of observations is 32. Find the resulting mean, if the observation is, multiplied by 2
If the mean of 8, 10, 7, x + 2 and 6 is 9, find the value of x.
Mean of 5 numbers is 20 and the mean of the other 5 numbers is 30. Find the mean of all the 10 numbers taken together.
Find the mean of: 12, 9, 6,11 and 17
