Question

In a research laboratory scientists treated 6 mice with lung cancer using natural medicine. Ten days later, they measured the volume of the tumor in each mouse and given the results in the table

Mouse marking	1	2	3	4	5	6
Tumor Volume (mm3)	145	148	142	141	139	140

Find the mean

Answer 1

Mouse marking (f)	Tumor Volume (mm3) (x)	fx
1	145	145
2	148	296
3	142	426
4	141	564
5	139	695
6	140	840
${\displaystyle \sum f}$ = 21		${\displaystyle \sum fx}$ = 2966

${\displaystyle \overline{x}=\frac{\sum fx}{\sum f}}$

= ${\displaystyle \frac{2966}{21}}$

= 141.238

= 141.24

The Arithmetic mean = 141.24 mm³