CA Foundation · Quantitative Aptitude · Measures of Central Tendency and Dispersion
What is the geometric mean of the three observations 4, 6 and 9?
The geometric mean is 6. It is the cube root of the product 4 × 6 × 9 = 216, since there are three observations. The figure 6.33 is the arithmetic mean, and 5.68 is the harmonic mean, so neither is the geometric mean.
- A6Correct
- B6.33
- C5.68
- D7
Explanation
GM = (4 × 6 × 9)^(1/3) = 216^(1/3) = 6. The value 6.33 is the arithmetic mean (19/3), which is a different average. The value 5.68 is the harmonic mean (108/19).
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