Question

Draw a pie diagram to represent the world population given in the following table, after determining the value of a.

Country	India	China	Russia	USA	Other	Total
Percentage of population	15	20	a	a	25	100

Answer 1

Total percentage of population=100
Therefore, according to the question,
15 + 20 + a + a + 25 = 100
$\Rightarrow$2a = 100-60
$\Rightarrow$2a = 40
$\Rightarrow$a = 20

Hence, the following table represents the world population.

Country	India	China	Russia	USA	Other	Total
Percentage of population	15	20	20	20	25	100

We compute the central angle for population of each country as shown.

Sr no.	Country	Percentage of population	Measure of central angle
1	India	15	$\frac{15}{100}\times 360°=54°$
2	China	20	$\frac{20}{100}\times 360°=72°$
3	Russia	20	$\frac{20}{100}\times 360°=72°$
4	USA	20	$\frac{20}{100}\times 360°=72°$
5	Other	25	$\frac{25}{100}\times 360°=90°$
	Total	100	360o

Pie diagram :