The following pie diagram shows percentage of persons according to blood group. Answer the following questions : (a) Find the measure of central angle for each blood group. (b) Find total number of persons if there are 600 persons of blood group B.

8. The following pie diagram shows percentage of persons according to blood group. Answer the following questions :
(a) Find the measure of central angle for each blood group.
(b) Find total number of persons if there are 600 persons of blood group B.




Sol.
a.
Blood Group
Percentage
Measure of Central angle
O
45
(45÷ 100)× 360 = 1620
A
20
(20÷ 100)× 360 = 720
B
30
(30÷ 100)× 360 = 1080
AB
5
(5÷ 100)× 360 = 180
Total
100
3600


b. Number of persons in blood group 'B' = (30÷100) × Total Number of persons.
∴ 600 = (3/10)× Total Number of Persons.
∴ Total number of Persons = 6000/3
∴ Total number of Persons = 2000 Persons.
Total numbers of persons are 2000.

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