Consider the following Amplitude Modulated (AM) signal, where fm < B:

$X_{AM}(t) = 10 (1+0.5 sin 2\pi f_m t) cos2\pi f_ct$

The AM signal gets added to a noise with Power Spectral Density S_n (f) given in the figure below. The ratio of average sideband power to mean noise power would be

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