Let y =1/2 (x1+x2)-, where x1 & x2 are independent of identically distributed gausian random variables...

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Let y =1/2 (x1+x2)-µ, where x1 & x2 are independent of identically distributed gausian random variables of mean µ and standard deviation σ. The <y^4>/σ^4 is: Let y =1/2 (x1+x2)-µ, where x1 & x2 are independent of identically distributed gausian random variables of mean µ and standard deviation σ. The <y^4>/σ^4 is:

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