The mean proportion of 1.21 and 0.09 is

$\frac{1.21}{x}$=$\frac{x}{0.09}$

Where = x = mean Proportion

$x^{2}$ = 1.21* 0.09
$x^{2}$ = 1.1*1.1*0.3*0.3
=> x = 1.1* 0.3 = 0.33

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