Question

Following tables show the weight the weight of 12 students:

Weights (in kgs):	67	70	72	73	75
Number of students:	4	3	2	2	1

Find the mean weight of the students to the nearest integer

Answer 1

Calculation of Arithmetic Mean

$x_i$	$f_i$	$f_i{x}_i$
$67$	$4$	$268$
$70$	$3$	$210$
$72$	$2$	$144$
$73$	$2$	$146$
$75$	$1$	$75$

$\sum f_i=12$

$\sum f_i{x}_i=843$

$\therefore$ Mean $=\overline{X}=\frac{\sum f_i{x}_i}{N}=\frac{843}{12}=70.25kg.$