<prompt> If bih rate of a sub-centre of population 5000 is 251000 then expected no. of pregnancies in a year will be:69125138150  <response>: Expected no. of live bihs Yyear Bih rate per 1000 population x population of the area 1000 As some pregnancies may not result in a live bih i.e. aboions and stillbihs may occur, the expected number of live bihs would be an under-estimation of the total number of pregnancies. Hence, a correction factor of 10 is required, i.e. add 10 to the figure obtained above. So, the total number of expected pregnancies Z Y 10 of Y Given Bih rate is 251000 population Population under the sub-center 5000 Therefore, expected number of live bihs 25 x 50001000 125 bihs Correction factor pregnancy wastage 10 of 125 say 13 Therefore, total no. of expected 125 13 138 pregnancies in a year 