Probabilities
Compute P(X1 + 2X2 -2X3 > 7), where X1, X2, X3 are iid randomvariables with common distribution N(1,4). You must give thenumerical answer.
Specify and show any formulas used for E, P, and Var
for example Var( X1 + 2X2 -2X3)= 4 + 22(4) + (-2)2(4) = 35. Please specifyhow all the individual numbers where obtained and the formulaused.
