Help me understand random variable in DSP

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danesh

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hi guys,

im having great trouble understanding the random variable part in dsp subject. hope any one could post me link or book i can study to understand this.

2) im not sure how to solve this problem:

Let x[n] be a zero-mean white noise sequence of unit variance. For each of the following filters compute the output autocorrelation Ryy(k) for all k, using z-transform
a). y[n] = x[n – 2] – x[n – 5]
 

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