Question

$30$ people gave money for donation. Find the average amount of money collected. (use Assumed mean).

• A. $150$
• B. $180$
• C. $170$
• D. $175$

Answer 1

The correct option is A $150$

Money	X	People (F)	d=X-A	Fd
75-125	100	7	-50	-350
125-175	150=A	8	0	0
175-225	200	8	100	800
225-275	250	7	150	1050
		$\Sigma F=30$		$\Sigma Fd=1500$

Mean (By shortcut method) = $A+\frac{\Sigma Fd}{\Sigma F}=100+\frac{1500}{30}=100+50=150$

D) Mean = 150