Final answer:
In quantum mechanics, the concept of state refers to the representation of a physical system using a wave function. The wave function describes the probability distribution of finding a particle in a specific location in space.
Step-by-step explanation:
In quantum mechanics, the concept of state refers to the representation of a physical system using a wave function. The wave function describes the probability distribution of finding a particle in a specific location in space. When making predictions, the wave function needs to be normalized, and the expectation value represents the average value of a quantity that requires integration with the wave function.