What does the histogram represent?
A histogram is a graphical representation of a frequency distribution. The histogram below is the approximate shape of a normal distribution, or a bell curve. The x-axis represents the weighted scores and the y-axis indicates the frequency (how many students received each score on the test). In most cases student scores will not form a perfect bell curve for a variety of reasons (including small class size). A histogram, therefore, is more useful for classes in which there are 30 or more students.
