X and Y are two DEPENDENT (meaning not-independent) random variables, then which of the following are true (check all they apply) The Variance of X-Y is the Variance of X plus the Variance of Y The Mean of X+Y is the Mean of X plus the Mean of Y The St.Dev of X+Y is the Std.Dev of X plus the Std. Dev of Y The Variance of X+Y is the Variance of X plus the Variance of Y The St.Dev of X-Y is the Std.Dev of X minus the Std. Dev of Y

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