Study the following table of population in a district and the average population served per doctor. Calculate the harmonic mean:\r\n \r\n\r\n\r\n\r\nAREA\r\n\r\n\r\nPOPULATION SERVED PER DOCTOR\r\n\r\n\r\nPOPULATION\r\n\r\n\r\nNUMBER OF DOCTORS\r\n\r\n\r\n\r\n\r\nRURAL\r\n\r\n\r\n1000\r\n\r\n\r\n50000\r\n\r\n\r\n50\r\n\r\n\r\n\r\n\r\nURBAN\r\n\r\n\r\n500\r\n\r\n\r\n50000\r\n\r\n\r\n100\r\n\r\n\r\n\r\n\r\nTOTAL\r\n\r\n \r\n\r\n100000\r\n\r\n\r\n150\r\n\r\n\r\n\r\n