If X and Y are random variables with variances o = 3 and σ = 9, X and Y are not independent, and oxy = 1, then find the variance of the random variable Z = -9X+8Y - 7.
Q: Determine the variance of Z.
A: Helpful formulas (i)VaX=a2VX(ii)VC=0,where c is the constant(iii)VaX+ bY=a2VX+ b2VY
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Q: ox²= 3, oy² = 5, oxy = 2, Z=2Y - 4X – 2 a. Determine the variance of Z.
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Q: I keep getting 675 as an answer but this answer isn't correct. Could you help me solve for this?
A: To find the variance of the random variable Z = 9X + 8Y - 7, we need to use the formula for the…
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