When the investigator has personally obtained the information for a particular purpose,this data is called ........ data.
- Aclasses
- Bsecondary data
- Cprimary data
- DFrequency
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Similar Questions
The mean of $10$ observations is calculated as $22.7$. It was later noticed that one observation was taken as $15$ instead of $51$ by mistake. Then,the correct mean of the data is ........
Medium
View SolutionThe range of the observations: $7, 9, 7, 5, 6, 6, 9, 18, 8, 8, 6$ is ..........
Easy
View SolutionFind the mean of the observations $15, 22, 18, 27, 31, 21, 14, 36, 25$ and $34$.
Easy
View SolutionDraw a histogram for the following frequency distribution with unequal class length:
Class $0-5$ $5-10$ $10-20$ $20-30$ $30-50$ $50-70$ $70-100$ Frequency $6$ $8$ $14$ $16$ $24$ $20$ $30$
| Class | $0-5$ | $5-10$ | $10-20$ | $20-30$ | $30-50$ | $50-70$ | $70-100$ |
| Frequency | $6$ | $8$ | $14$ | $16$ | $24$ | $20$ | $30$ |
Medium
View SolutionFind the number of observations,if the sum of some observations is $975$ and their mean is $32.5$.
Easy
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