Study the bar graph representing the number of persons in various age groups in a town shown in Fig. 23.9. Observe the bar graph and answer the following questions:
(i) What is the percentage of the youngest age-group persons over those in the oldest age group?
(ii) What is the total population of the town?
(iii) What is the number of persons in the age-group 60-65?
(iv) How many persons are more in the age-group 10-15 than in the age group 30-35?
(v) What is the age-group of exactly 1200 persons living in the town?
(vi) What is the total number of persons living in the town in the age-group 50-55?
(vii) What is the total number of persons living in the town in the age-groups 10-15 and 60-65?
(viii) Whether the population in general increases, decreases or remains constant with the increase in the age-group.
(i) The percentage of the youngest age-group persons over those in the oldest age group is:
= 
× 100
= 466.67
(ii) Total population of the town:
1400 +1200 +1100 +1000 +900 +800 +300
= 6700
(iii) The number of persons in the age-group 60-65 are 800.
(iv) The number of persons that are more in the age-group 10-15 than in the age group 30 - 35 = 1400-1100
=300
(v) The age-group of exactly 1200 persons living in the town is 20 -25
(vi) The total number of persons living in the town in the age-group 50-55 is 900
(vii) The total number of persons living in the town in the age-groups 10-15 and 60-65 is
= 1400 +800
= 2200
(viii) With the increase in the age group, the population decreases.