The Probability Density Function (PDF) is a graphical function that shows the probability with which a certain event
lies above or below the graph. Such a graph merely represents a threshold for the probability statement.A typical example is the Gaussian distribution curve. If the events to be evaluated are plotted in the coordinate system
with the distribution curve, then quite a few events lie above, others below the bell curve. The statement that can be associated with this refers to the probability with which an event lies above or below the bell curve. Such considerations play a role, for example, in the calculation and determination of field strengths and the planning of mobile radio transmitters, or also in the acoustic radiation of halls.