1. The problem statement, all variables and given/known data 1. Obtain an expression for operator of coordinate in momentum representation. To this end begin with definition of the average coordinate x = ∫ψ*(x)xψ(x)dx express the wave functions as wave packets in terms of plane waves, and rewrite the expression for average coordinate in such a way that it would have a form of an operator acting on the wave functions in the momentum representation. 2. Relevant equations Not sure 3. The attempt at a solution Where do I start? I'm not sure what the question is even asking.