Probability of Landing at a Location

We cannot predict with certainty where each electron will go. It is possible that everybody could give a different prediction for the location where the next electron would appear. Yet, each of the predictions could be equally correct. With electrons, we can really only describe location in terms of probability.
 
Below is the same electron diffraction pattern you used to predict where an electron would go. On it, label where the probability of detecting an electron is highest, where it is lowest, and then indicate at least two places that have identical probabilities.
 


Simulated electron diffraction pattern with your labels for highest probability and lowest probability.

 
So far we have seen two results of the double slit experiment with electrons
  1. Electrons behave as waves causing a pattern of light and dark regions to develop on the screen.
  2. It is not possible to predict where any one electron may appear on the screen when it is sent through a double slit. However, we can state the probability of it appearing in various locations.
Now we will learn how results 1) and 2) are related to each other and develop a single concept that is consistent with both results.