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प्रश्न
- Find the mean of 7, 11, 6, 5 and 6.
- If each number given in (a) is diminished by 2; find the new value of mean.
उत्तर
a. The mean of 7, 11, 6, 5 and 6
`barx = (7 + 11 + 6 + 5 + 6)/5`
= `35/5`
= 7
b. If we subtract 2 from each number, then the mean will be 7 – 2 = 5
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The mean of a certain number of observations is 32. Find the resulting mean, if the observation is, multiplied by 2
Find the mean of: 2.1, 4.5, 5.2, 7.1 and 9.3
Find the mean of 35, 44, 31, 57, 38, 29, 26,36, 41 and 43.
Which of the following has the same mean, median and mode?
An incomplete frequency distribution is given below
| Variate | Frequency |
| 10 – 20 | 12 |
| 20 – 30 | 30 |
| 30 – 40 | ? |
| 40 – 50 | 65 |
| 50 – 60 | 45 |
| 60 – 70 | 25 |
| 70 – 80 | 18 |
| Total | 229 |
Median value is 46, the missing frequency is:
