If harmonic mean of first 5 observations is 52and  harmonic mean of another 5 observations is 92then harmonic mean of all 10 observations is

Let H1, and n1, are the harmonic mean and number ofobservations of first group and H2and n2 are theharmonic mean and number of observations of anothergroup.∴ By using combined harmonic mean formula, we getcombined harmonic mean =n1+n2n1H1+n2H2=5+555+59=10289=9028=4514