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                    c.   What is the total number of students who like
                        zip-lining and obstacle courses?                                           ______________
                    d.    What is the difference in the number of students
                         who like cycling and zip-lining?                                          ______________

            Bar graph


            reading a Bar graph

            We know that a collection of information in the form of numbers is called numerical

            data. When the  numerical  data  is  represented  using  rectangular  bars  of different
            heights, it is called a bar graph. In a bar graph, the bars are of equal width and have
            equal spaces between them. A bar graph has:

                     i.  a title        ii. horizontal and vertical axes            iii. labels on both the axes
            Example 1. The bar graph given alongside shows                 Cars of different brands sold in a month

            the number of cars of different brands sold by                  Y  Scale: On vertical axis, 1 unit = 2 cars
            a dealer in a particular month. Read the graph
            carefully and answer the following questions:

                    a.   How many cars of brand D were sold?

                    b.    How many cars of brand B were sold?

                    c.   Which car brand had the maximum
                        sales?
                    d.   Which car brand had the minimum

                        sales?
                    e.    How many cars were sold in the month?                                                    X

            Solution.

                    a.  14 cars              b.  10 cars              c.  Brand C              d.  Brand B

                    e.  16 + 10 + 22 + 14 + 18 = 80 cars

            Drawing a Bar graph

            We should keep the following points in mind, while drawing a bar graph.

                1.  The title of the graph should be written at the top.
              2.  The items  represented  along  horizontal  and  vertical  lines  should  be  labelled

                    along the lines.
              3.  A convenient and clear scale should be used.

              4.  Bars of equal width should be drawn with equal gaps between them.

              5.  Bars should be shaded or coloured.


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