QuestionSuppose X1,X2,X3∼X_1,X_2,X_3\sim i.i.d. XX such that E[X]=10E[X]=10 and Var(X)=4\operatorname{Var}(X)=4. Define Y=X1−X2+X3Y=X_1-X_2+X_3 and Z=2YZ=2Y. Choose the correct option(s).
