Find the average normalized power in the waveform-nbsp

Question

1. Find the average normalized power in the waveform x(t) = A cos 2Πf_ot using:
(i) Time averaging.
(ii) Summation of the spectral components

2. A sinusoid generator output voltage is A cos wt . The output is sampled randomly. The sampled output is a random variable X, which can take any value in the range (-A, A).
Determine;
a. Mean.
b. Variance of the sampled output X.