Question

What is the average weight of $40$ people whom are diagnosed for thyroid? (use Assumed mean method).

• A. $90.75$
• B. $101.45$
• C. $87.25$
• D. $95$

Answer 1

The correct option is A $90.75$

Weight	X = $\frac{U.L.+L.L.}{2}$	Patients (F)	d=X-A	Fd
65-75	70	3	-30	-30
75-85	80	13	-20	-260
85-95	90	12	-10	-120
95-105	100 = 100	8	0	0
105-115	110	4	10	40
		$\Sigma F=40$		$\Sigma Fd=-430$

Mean by Shortcut Method = $A+\frac{\Sigma Fd}{\Sigma F}=100+\frac{-370}{40}=100-9.25=90.75$

A) Mean = 90.75