Prepared for Contemporary Physics by
Dean Zollman, Wally Axmann, Bob Grabhorn,
Carol Regehr, and Paul Donovan
Spring, 1994
From Kansas State University:http://bluegiant.phys.ksu.edu/dvi/vqm/vqm.html
The total probability that the object is "somewhere" is 1. The area
under a probability versus position curve must therefore equal 1.
For this wavefunction

the probability of the object being somewhere between locations x1 and x2 is
equal to the area under the probability curve (the
square of the wavefunction)
bounded by x1 and x2.:

Visual Quantum Mechanics: Table of Contents