1. The problem statement, all variables and given/known data An electron is in the spin state in the Sz representation |ψ> = A (1-2i 2)T <- this is a 2 X 1 matrix If Sx is measured, what values and probabilities do you get? What is the expectation value of Sx? 2. Relevant equations 3. The attempt at a solution So first, I need to find what A equals to: A^2 [ (1-2i)(1+2i)+ 4 ] = 1 thus A = 1/3 now, I need to know what values of Sx I would get and the probabilities to proceed to find the expectation value. What values of Sx would I get??? could it be just +/- h-bar/2 ?? What would be the probabilities?? I would really appreciate any hint or help!