Frequency Distributions and Histograms
A frequency distribution is a way of organizing data that shows how often each value or group of values occurs in a dataset. It helps summarize large amounts of data by displaying the number of times each value appears.
In frequency distribution data values are grouped into classes of equal widths, called bins or intervals. The smallest and largest observations in each class are called class limits.
A relative frequency distribution shows the fraction of data values that fall in a class. A cumulative frequency distribution of a frequency distribution. shows how many data values fall in either that class or any class to its left.
Histograms are graphical representations of frequency distributions where the width and position of rectangles are used to indicate the various classes, with the heights of those rectangles indicating the frequency with which data fell into the associated class.
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