(i) Youngest age-group is 10-15 years 

The number of persons belonging to this group = 1400 

The oldest age-group is 70-75 years and 

The number of persons belonging to this group = 300 

Now, 

The percentage of youngest age-group persons over those in the oldest group is as below: 

1400/300 x 100 = 1400/3 

(ii) Population of the town = 300 + 800 + 900 + 1000 + 1100 + 1200 + 1400 = 6700 

(iii) Number of persons in the age group 60 – 65 = 800. 

(iv) Number of persons in the age group 10 – 15 = 1400 

Number of persons in the age group 30-35 = 1100. 

Hence the number of more persons in the age group 10 – 15 than the group 30-35 is 1400 — 1100 = 300. 

(v) Age group of 1200 persons living in the town is 20 – 25. 

(vi) Total number of persons living in the town in the age-group 50 – 55 is 900. 

(vii) Total number of persons living in the town in the age-groups 10 -15 and 60 – 65 is 1400 + 800 = 2200. 

(viii) We have observed that, the height of the bars decreases as the age-group increases. 

Hence, the population decreases with the increases in the age-group.