quantum mechanics - Probability of non-normalizable states

In the book Quantum Field Theory by Jakob Schwichtenberg, he is discussing about non-normalizable states in chapter 8. If you compute the normalization in $(8.67)$ you just get infinity. He said on

Quantum Mechanics: Reference: Griffiths CH 2, 3, 6.1 6.2, 7.1, 8.1

Notes on Quantum Mechanics

Physics 3 for Electrical Engineering Ben Gurion University of the

UnBorn: Probability in Bohmian Mechanics - Philosophy of Physics

PDF) Non-unitary evolution of a pure state into a mixed state in

Lectures on Quantum Mechanics. With Problems, Exercises and

SOLUTION: Postulates of quantum mechanics Msc physics - Studypool

A Theory of Everything in Physics without Quantum Field Theory

Physics 3 for Electrical Engineering Ben Gurion University of the

Postulates of Quantum Mechanics - Laboratory, EEE 352

The probability density is plotted as a function of x for two