The data here shows an hypothetical age distribution of the population of a town in Nigeria.
Sex
Age in years
10 and below
11-14 15-3
36 - 64
65 and above
Male
1350
2275 1135
Y
3250
Female
2650
2725 1365
4265
Z
Total
4000
X 2500
7500
6000
From this data, calculate: (a) X, Y, Z. (b) The total population of the town. (c) The difference be-tween the population of male and female aged 14 and below. (d) The percentage of the population aged 14 and below. (e) The dependency ratio in the town.
Explanation
(a) X = Male (2275) + Female (2725) 5000 Y = Total - Female = 7500 - 4265 = 3235 Z = Total - Male = 6000 - 3250 = 2750 (b) Total population: 10 and above: 4,000 11 - 14 5,000 15 - 35 2,500 36 - 64 7,500 65 & above 6,000 Total 25,000 (c) Females of 14 years and below = 2650 + 2725 = 5375 Males of 14 years and below = 1350 + 2275 = 3625 Difference between the population of male and female aged 14 and below = 5375 - 3625 = 1750 (d) Percentage of population aged 14 years and below: Female aged 14 years and below plus male aged 14 years and below. 5375 + 3625 = 9000 or 4000 + 5000 = 9000 = \(\frac{9000}{25000} \times \frac{100}{1}\) = 36% (e) Dependency ratio =Population of Less than 14 years +population of more than 65 years population of 15 - 35 + population of 36 - 64 years = \(\frac{9000 + 6000}{2500+7500} = \frac{15,000}{10000}\) = \(\frac{3}{2}\) = 3:2
