Krishna
1

Step 1: Definition of histogram

        A histogram is a type of graph that is used in statistics. Histograms are similar to bar charts they are a way to display counts of data. The heights of the bars indicate the frequencies or relative frequencies of values in our data set.


Step 2: Make a frequency distribution table for the given data.

              GIVEN DATA: 1.45 2.20, 0.75, 1.23, 1.25, 1.25, 3.09, 1.99, 2.00, 0.78, 1.32, 2.25, 3.15, 3.85, 0.52, 0.99, 1.38, 1.75, 1.22, 1.75.


               Skill 1:  Divide this into intervals(bins or classes) of equal length:

                          Example:   0.50 - 0.99, 1.00 - 1.49, 1.50 - 1.99, 2.00 - 2.49, 

                                           2.50 - 2.99, 3.00 - 3.49, and 3.50 - 3.99


                Skill 2: Count the number of data points which fall into each interval

                         Frequency distribution table

                          0.50  - 0.99      4     (0.52, 0.75, 0.78, 0.99)

                          1.00  - 1.49      7

                          1.50  - 1.99      3

                          2.00  -  2.49     3

                          2.50  -  2.99     3

                          3.00  -  3.49     2

                          3.50  -  3.99     1

                                total          20


Step 3: Choose a scale for the axis that will accommodate the class and frequency


Step 4: Construct bars for each class. The height of each bar should correspond to the frequency of the class at the base of the bar.