Question : The mean proportion of 169 and 144 is:
Option 1: 156
Option 2: 147
Option 3: 126
Option 4: 165
Correct Answer: 156
Solution :
Mean proportion of $a$ and $b$ is $\sqrt{ab}$.
So, the Mean proportion of 169 and 144 $=\sqrt{169\times 144}=156$
Hence, the correct answer is 156.
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