What is the geometric means of the observations 125, 729, 1331?



[ A ]    495
right
[ B ]    1485
[ C ]    2221
[ D ]    None of these
Answer : Option A
Explanation :
G.M. = $3\sqrt{125 X 729 X 1331}$ = $3\sqrt{5^3 X 9^3 X 11^3}$ = 5 × 9 × 11 = 495

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