By Assumed mean method
Production $(1000)$ RS. Class Mark $u i = x i - A$ Frequency Fi Fiui
$25 - 30$ $25.5$ $- 2$ $20$ $- 40$
$30 - 35$ $26.5$ $- 1$ $25$ $- 25$
$35 - 40$ $27.5$ $0$ $15$ $0$
$40 - 45$ $28.5$ $1$ $10$ $10$
$45 - 50$ $29.5$ $2$ $10$ $20$
$\sum f i = 80$ $\sum f i u i =$

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Solution

Production Class Mark ui fi fiui
$25 - 30$ $25.5$ $- 2$ $20$ $- 40$
$30 - 35$ $26.5$ $- 1$ $25$ $- 25$
$35 - 40$ $27.5$ $0$ $15$ $0$
$40 - 45$ $28.5$ $1$ $10$ $10$
$45 - 50$ $29.5$ $2$ $10$ $20$
_ ___
$\sum f i = 80$ $\sum f i u i = - 35$

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Similar questions

CI	$0 - 5$	$5 - 10$	$10 - 15$	$15 - 20$	$20 - 25$	$25 - 30$	$30 - 35$	$35 - 40$	$40 - 45$	$45 - 50$
$f$	$9$	$13$	$6$	$12$	$9$	$6$	$10$	$15$	$6$	$4$

Class:	$5 - 10$	$10 - 15$	$15 - 20$	$20 - 25$	$25 - 30$	$30 - 35$	$35 - 40$	$40 - 45$
Frequency:	$5$	$6$	$15$	$10$	$5$	$4$	$2$	$2$

Size of item	$10 - 15$	$15 - 20$	$20 - 25$	$25 - 30$	$30 - 35$	$35 - 40$	$40 - 45$	$45 - 50$
No. of items	$4$	$8$	$18$	$30$	$20$	$10$	$5$	$2$

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