Q.Distinguish between Crude Birth Rate and Crude Death Rate.

These two vital rates together tell us whether a population's natural growth is rising or falling.

Crude Birth Rate (CBR) and Crude Death Rate (CDR) are the two most basic vital rates used to describe a population's natural change.

Crude Birth Rate (CBR) is the number of live births occurring in a population during a year, expressed per 1,000 of the mid-year population:

Crude Death Rate (CDR) is the number of deaths occurring in a population during a year, expressed per 1,000 of the mid-year population:

$CDR = \frac{\text{Number of deaths in a year}}{\text{Mid-year total population}} \times 1000$ …

CBR = (Live Births ÷ Mid-year Population) × 1000; CDR = (Deaths ÷ …

Students sometimes forget the '× 1000' multiplier or use the population at the end of the year rather than the mid-year (average) …