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  9. Q97

UKPSC PCS 2010 · Question 97 of 138

The Arithmetic mean of some observation is -4 and harmonic mean is minus nine the geometric mean will be

Statistics

  1. A-13
  2. B– 6Correct
  3. C-18
  4. D-36

Answer: B. – 6

Explanation

GM^2 = AM x HM = (-4)(-9) = 36, so GM = -6 (sign as given).

Source: UKPSC Lower PCS Prelims 2010 (Combined Lower Subordinate Services Exam), held 2011

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