Question
For a normal distribution, the first quartile and the mean deviation are $20$ and $24$ respectively. Obtain an estimate of the value of mode.
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| Marks of understanding English grammar $(x)$ | $28$ | $15$ | $5$ | $10$ | $15$ | $25$ | $15$ | $20$ |
| Marks of understanding Gujaratigrammar $(y)$ | $27$ | $10$ | $22$ | $20$ | $6$ | $14$ | $10$ | $8$ |