CA Foundation · Quantitative Aptitude · Sequence and Series
What is the geometric mean of the two positive numbers 4 and 64?
The geometric mean of 4 and 64 is 16. It is the square root of their product, since 4 × 64 = 256 and √256 = 16. The value 34 is the arithmetic mean, not the geometric mean.
- A16Correct
- B34
- C32
- D8
Explanation
The geometric mean of two numbers a and b is the square root of their product. Here the product is 4 × 64 = 256, and √256 = 16. The value 34 is the arithmetic mean (4+64)/2, which is a different mean and is wrong here.
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