Question : The mean proportion of numbers 0.049 and 0.9 is:
Option 1: 0.021
Option 2: 0.21
Option 3: 0.63
Option 4: 21
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Correct Answer: 0.21
Solution : According to the question, $c = \sqrt {ab}$ Where c is the mean proportion of a and b Now, the mean proportion of 0.049 and 0.9 = $\sqrt{0.049 \times 0.9}$ = $0.21$ Hence, the correct answer is 0.21.
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