The word 'demography' is derived from two Greek words 'demos' meaning people and 'graphy' meaning science or studies. So, demography refers to the study of human population . It makes scientific and statistical study of population with respect to its size. The study of human population is very important. It has developed as a separate discipline of modern time. It gives us information and idea about the population situation and its trend. Problems of its management and solution . So, it is essential in planning and developmental activities of every human society.

Total live birth =915
Mid-year population =32423
Crude Birth Rate (CBR) =?

We know,
CBR = Total live birth/total mid-year population*1000
= 915/32425*1000
= 28.22 per thousand.

Therefore, crude birth rate of the district was 28.22 per thousand mid-year populations.