Find mean deviation about $¯ x$ .
$x$ $f$
$3$ $2$
$5$ $7$
$7$ $10$
$9$ $9$
$12$ $5$
$14$ $2$

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Solution

$\begin{matrix} \sum f = 35, \sum f x = 280 m e a n d e v i a t i o n a b o u t (¯ x) ¯ x = \frac{\sum f x}{\sum f} = \frac{280}{35} = 8 M . D m e a n = \frac{\sum f | x; - ¯ x |}{N} \Rightarrow \frac{82}{35} \Rightarrow 2.34 \end{matrix}$

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Similar questions

Score $(x)$	$6$	$20$	$8$	$18$	$16$	$12$	$14$	$10$
Frequency $(f)$	$2$	$7$	$11$	$27$	$18$	$13$	$17$	$5$

Item	$8$	$10$	$12$	$14$	$16$	$18$
Frequency	$10$	$5$	$11$	$7$	$8$	$9$

x_{i}

f_{i}

Score $(x)$	$6$	$20$	$8$	$18$	$16$	$12$	$14$	$10$
Frequency $(f)$	$2$	$7$	$11$	$27$	$18$	$13$	$17$	$5$

Variate $(x)$	$0$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$
Freaquency $(f)$	$15$	$46$	$91$	$162$	$110$	$95$	$82$	$26$	$13$	$2$

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