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?
(vii) Whether the population in general increases, decreases or remains constant with the increase in the age-group.
(1) The youngest age-group is 10-15 years. The number of persons belonging to this group is 1400. The oldest age-group is 70-75 years. The number of persons belonging to this group is 300. The percentage of youngest age-group persons over those in the oldest group is
(2) The population of the town is
(3) The number of persons in the age group 60-65 is 800.
(4) The number of persons in the age group 10-15 is 1400 and the number of persons in the age group 30-35 is 1100. Hence the number of more persons in the age group 10-15 than the group 30-35 is 1400 – 1100
(5) The age group of 1200 persons living in the town is 20-25.
(6) The total number of persons living in the town in the age-group 50-55 is 900.
(7) The total number of persons living in the town in the age-groups 10-15 and 60-65 is 1400 + 800
(8) It is shown from the bar graph that the height of the bars decreases as the age-group increases.
Hence, the population decreases with the increases in the age-group.