2.2 histogram
a histogram of frequency distribution represents a graphic form of processing the results of mass discovery or a set of measurements it is a block diagram which displays the division of absolute or relative frequency of a monitored variable at individual intervals the base of individual blocks < on the x axis > corresponds to the width of interval and the height of the blocks < on the y axis > expresses the frequency of variables of the monitored variable at appropriate intervals in quality management it mainly refers to the frequency distribution of quality values or values related to production factors influencing the quality of the products information which can be read from a histogram