Question

The mean height of $12$ men is $1.70m$, and the mean height of $8$ women is $1.60m$. Find:the total height of the $12$ menthe total height of the $8$ womenthe mean height of the $20$ men and women.

Answer 1

$\Rightarrow$ The mean height of $12$ men $=1.70m$

$\therefore$ The total height of $12$ men $=12\times 1.70=20.4m$

$\Rightarrow$ The mean height of $8$ women $=1.60m$

$\therefore$ The total height of $8$ women $=8\times 1.60=12.8m$

$\Rightarrow$ The mean height of $20$ men and women $=\frac{20.4+12.8}{20}$

$=\frac{33.2}{20}$

$=1.66$