Questions
If harmonic mean of first 5 observations is and harmonic mean of another 5 observations is then harmonic mean of all 10 observations is
detailed solution
Correct option is B
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=4514Talk to our academic expert!
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An automobile driver travels from a plain to a hill station 120 km away at an average speed of 30 km per hour. He then makes the return trip at an average speed of 25 km per hour. He covers another 120 km on the plain at an average speed of 50 km per hour. His average speed (in km/hr) over the entire distance of 360 km will be
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