Find the mean weight from the following table.
Weight ( $k g$ ) $29$ $30$ $31$ $32$ $33$
No. of children $02$ $01$ $04$ $03$ $05$

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Solution

Weighted Mean $= \frac{(2 \times 29) + (1 \times 30) + (4 \times 31) + (3 \times 32) + (5 \times 33)}{2 + 1 + 4 + 3 + 5}$
Weighted Mean $= 31.53$

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Find the mean weight from the following table.

Weight (kg)	29	30	31	32	33
No. of children	02	01	04	03	05

\begin{matrix} 02 & 04 & (20) 03 & 05 & (34) 06 & 08 & (. . . .) \end{matrix}

Year	Sugar Production (Lakh Tonnes)
$2000 - 01$	$95$
$2001 - 02$	$130$
$2002 - 03$	$180$
$2003 - 04$	$160$
$2004 - 05$	$125$

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(3) m² − 4m = 0

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(7) (2n + 1) (3n − 2) = 0

(8) (5z − 2) (7z + 3) = 0

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Weight ( $k g$ )	$29$	$30$	$31$	$32$	$33$
No. of children	$02$	$01$	$04$	$03$	$05$