For a given frequency distribution,$A = 450, c = 100, \Sigma f_{i} u_{i} = -20$ and $\Sigma f_{i} = 20$. Then,the mean $\bar{x} = \ldots$
- A$275$
- B$350$
- C$450$
- D$430$
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While computing the mean of grouped data,we assume that the frequencies are
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View SolutionFor a given frequency distribution,$\Sigma f_{i} x_{i} = 1790$ and $\Sigma f_{i} = 50$. Then,the mean $\bar{x} = $ ..........
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View SolutionThe following table gives the number of pages written by Sarika for completing her own book over $30$ days:
Number of pages written per day $16-18$ $19-21$ $22-24$ $25-27$ $28-30$ Number of days $1$ $3$ $4$ $9$ $13$
Find the mean number of pages written per day.
| Number of pages written per day | $16-18$ | $19-21$ | $22-24$ | $25-27$ | $28-30$ |
| Number of days | $1$ | $3$ | $4$ | $9$ | $13$ |
Find the mean number of pages written per day.
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View SolutionFind the mean of the following frequency distribution:
Class
$21-25$
$26-30$
$31-35$
$36-40$
$41-45$
$46-50$
$51-55$
Frequency
$18$
$32$
$30$
$40$
$25$
$15$
$40$
(in $.675$)
| Class | $21-25$ | $26-30$ | $31-35$ | $36-40$ | $41-45$ | $46-50$ | $51-55$ |
| Frequency | $18$ | $32$ | $30$ | $40$ | $25$ | $15$ | $40$ |
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View SolutionFind the mean of the following frequency distribution:
Class $0-10$ $10-20$ $20-30$ $30-40$ $40-50$ $50-60$ $60-70$ $70-80$ Frequency $2$ $4$ $10$ $20$ $18$ $20$ $16$ $10$
| Class | $0-10$ | $10-20$ | $20-30$ | $30-40$ | $40-50$ | $50-60$ | $60-70$ | $70-80$ |
| Frequency | $2$ | $4$ | $10$ | $20$ | $18$ | $20$ | $16$ | $10$ |
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