Answer
Magnitude of the normal force is greatest at the bottom, then mid-height, and its the least at the top.
Work Step by Step
Due to the force of gravity, the rider has the greatest transnational velocity at the bottom of the ride. With more downwards velocity, there is more force pushing down on the rider, which means more normal force pushing it up. As the rider ascends, its velocity decreases; as does its normal force.
