<prompt> Bih rate isLive bih X 1000 mid yr. PopulationBih X 1000 mid yr populationLive bih X 10000 mid yr. PopulationLive bih X 10000Population of reproductive age group 15-45  <response>: Bih rate number of live bihs during the year X 1000 estimated mid year population. Unsatisfactory measure of feility because the total population is not exposed to child bearing. Reference : Park;s textbook of preventive and social medicine, 23rd edition, pg no: 488 