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The variance of the sum of two independent random variables X and Y is equal to the sum of their variances. That is, if X and Y are independent random variables, then:
sigma^2 {X+Y} = sigma^2(X) + sigma^2(Y).
The problem statements says both x, y are two independent "normal" random deviates: 3**2 + 4**2
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Standard Deviation Puzzles - 3
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The variance of the sum of two independent random variables X and Y is equal to the sum of their variances. That is, if X and Y are independent random variables, then:
sigma^2 {X+Y} = sigma^2(X) + sigma^2(Y).
The problem statements says both x, y are two independent "normal" random deviates: 3**2 + 4**2