Find the mean proportion of \(\frac{1}{4}\) and \(\frac{1}{81}\) .
Answer & explanation
Correct answer: option 3
Mean proportion of a and b = \(\sqrt {a × b }\)
⇒ Mean proportion = \(\sqrt {\frac{1}{4} × \frac{1}{81}}\)
= \(\frac{1}{2 × 9}\) = \(\frac{1}{18}\)