What is the mean deviation of a frequency distribution equal to?
- A$\frac{\Sigma d_i}{\Sigma f_i}$
- B$\frac{\Sigma |d_i|}{\Sigma f_i}$
- C$\frac{\Sigma f_i d_i}{\Sigma f_i}$
- D$\frac{\Sigma f_i |d_i|}{\Sigma f_i}$
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Calculate the mean deviation about the mean of the set of first $n$ natural numbers when $n$ is an even number.
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If the mean deviation about the median of $x, 2x, 3x, 4x, 5x, 6x, 7x, 8x, 9x, 10x$ is $30$,then $|x|$ equals:
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Find the mean deviation about the median for the following data:
$x_i$ $3$ $6$ $9$ $12$ $13$ $15$ $21$ $22$ $f_i$ $3$ $4$ $5$ $2$ $4$ $5$ $4$ $3$
| $x_i$ | $3$ | $6$ | $9$ | $12$ | $13$ | $15$ | $21$ | $22$ |
| $f_i$ | $3$ | $4$ | $5$ | $2$ | $4$ | $5$ | $4$ | $3$ |
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