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| rev | Admin | (Created page with "'''Answer: C''' <math>Z_{3}=2 Z_{1}+Z_{2}</math> so that <math>\operatorname{Var}\left(Z_{3}\right)=4 \operatorname{Var}\left(Z_{1}\right)+\operatorname{Var}\left(Z_{2}\right)+4 \operatorname{Cov}\left(Z_{1}, Z_{2}\right)</math> where <math>\operatorname{Cov}\left(Z_{1}, Z_{2}\right)=\underbrace{E\left[Z_{1} Z_{2}\right]}_{=0}-E\left[Z_{1}\right] E\left[Z_{2}\right]=-(1.65)(10.75)</math> <math display="block"> \begin{aligned} \operatorname{Var}\left(Z_{3}\right) & =4...") | Jan 18'24 at 13:02 | +562 |