In a series,if $4$ appears $3$ times,$5$ appears $4$ times,$6$ appears $5$ times,$7$ appears $8$ times,$8$ appears $7$ times,and $9$ appears $6$ times,then the mode of the numbers is = .......
- A$9$
- B$8$
- C$7$
- D$6$
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Karl Pearson's coefficient of skewness of a distribution is $0.32$. Its standard deviation $(S.D.)$ is $6.5$ and the mean is $39.6$. The median of the distribution is:
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Class $0-5$ $5-10$ $10-15$ $15-20$ $20-25$ $25-30$ Frequency $(f_i)$ $3$ $4$ $7$ $11$ $2$ $5$
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| Frequency $(f_i)$ | $3$ | $4$ | $7$ | $11$ | $2$ | $5$ |
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