<prompt> Study the following table of population in a district and the average population served per doctor. Calculate the harmonic mean: AREA POPULATION SERVED PER DOCTOR POPULATION NUMBER OF DOCTORS RURAL 1000 50000 50 URBAN 500 50000 100 TOTAL 100000 150500567667750  <response>: Calculation of harmonic mean is as follows: 5000050000500001005000050667 Ref : Medical biostatistics, 1st edition pg: 118 