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