Two possible observations have arithmetic mean 3 and geometric mean 22.If each observation is multiplied by 2, then harmonic mean will be

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163

None of these

answer is A.

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Detailed Solution

Since, we know that(GM)2=AM×HM(22)2=3×HM⇒ HM=83Also, given here that, if each observation is multipliedby 2, then HM=83×2=163

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