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	Proof for the variance of a difference of random variables: Var(X-Y) = Var(X)+Var(Y)-2Cov(X,Y) (Stats4Everyone) View
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	Expectation Algebra (3 of 3: Why is the Var(X+Y)=Var(X)+Var(Y) for Independent Random Variables) (Maths Partner) View
	Problem to find Var(X+Y) and Var(X-Y) if mean, variances of Random variables X and Y are given (Munipraveena Rela's Classroom) View
	Variance (Michael Kelly) View
	#85 Covariance properties with proofs part 1 (Phil Chan (philchan)) View
	L12.7 The Variance of the Sum of Random Variables (MIT OpenCourseWare) View