Question
For a frequency distribution, skewness is $-3.3$ and quartile deviation is $11$ . Find the coefficient of skewness.
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| Mid value | $250$ | $350$ | $450$ | $550$ | $650$ | $750$ | Total |
| Frequency | $20$ | $80$ | $80$ | $40$ | $60$ | $20$ | $300$ |