While computing the mean of grouped data,we assume that the frequencies are
- Aevenly distributed over all the classes
- Bcentred at the lower limits of the classes
- Ccentred at the upper limits of the classes
- Dcentred at the classmarks of the classes
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Similar Questions
Find the mode of the following frequency distribution:
Class $0-20$ $20-40$ $40-60$ $60-80$ $80-100$ $100-120$ Frequency $8$ $9$ $26$ $23$ $20$ $14$
| Class | $0-20$ | $20-40$ | $40-60$ | $60-80$ | $80-100$ | $100-120$ |
| Frequency | $8$ | $9$ | $26$ | $23$ | $20$ | $14$ |
Medium
View SolutionFind the mean of the following data:
Class $200-299$ $300-399$ $400-499$ $500-599$ $600-699$ $700-799$ $800-899$ Frequency $3$ $61$ $118$ $139$ $126$ $151$ $2$
| Class | $200-299$ | $300-399$ | $400-499$ | $500-599$ | $600-699$ | $700-799$ | $800-899$ |
| Frequency | $3$ | $61$ | $118$ | $139$ | $126$ | $151$ | $2$ |
Medium
View SolutionIn the formula $M = l + \frac{(\frac{n}{2} - cf)}{f} \times c$ for the median,$cf = \ldots \ldots \ldots$
Easy
View SolutionThe median class in the following frequency distribution is ..........
Class $20-25$ $25-30$ $30-35$ $35-40$ $40-45$ $45-50$ $50-55$ Frequency $2$ $5$ $8$ $10$ $7$ $10$ $3$
| Class | $20-25$ | $25-30$ | $30-35$ | $35-40$ | $40-45$ | $45-50$ | $50-55$ |
| Frequency | $2$ | $5$ | $8$ | $10$ | $7$ | $10$ | $3$ |
Easy
View SolutionThe mean of ungrouped data and the mean calculated when the same data is grouped are always the same. Do you agree with this statement? Give reason for your answer.
Easy
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