Venn Diagrams - PowerPoint by wanghonghx

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									Venn Diagrams
               Venn Diagram
A Venn diagram is a way to display sets of data.

   Each set is shown as data inside a circle.

   Items that belong to both sets are shown in the
    overlapping region of the two circles.
                    Example 1
Riley surveyed students about what kind of
music they like. The Venn diagram shows the
number of students who like rock music, country
music, or both.

       Favorite Music        How many students like rock music?

                                      7 + 9 = 16
   Rock            Country


                                 How many student like rock
   7         9           6       music only?

                                         7
                     Example 2
    All students who participated in an art contest
    entered a painting, a sculpture, or both.
   12 students entered a painting
   9 students entered a sculpture
   4 students entered both

    How many students entered a painting, but not a
    sculpture?
    How many students entered a sculpture, but not a
    painting?
    Draw a Venn diagram and fill it in with the
    information given.
                           Art Contest Entries


                      Painting            Sculpture



                       8           4             5
12 – 4 = 8
                                                                   9–4=5




             8 students entered a painting, but not a sculpture.


             5 students entered a sculpture, but not a painting.
             Example 3

Of 300 students surveyed, 74 said they
enjoyed playing baseball, 162 said they
enjoyed football, and 64 said they enjoyed
both.

How many students like football only?
How many students like baseball only?
How many do not enjoy either?
                      Draw a Venn diagram.


                      Football               Baseball



                      98           64             10

162 – 64 = 98                                                 74 – 64 = 10




                                  128

Enjoy football only        Do not enjoy either          Enjoy baseball only


                           98 + 64 + 10 = 172
                           300 – 172 = 128
   HOMEWORK
   Complete worksheet
“Venn Diagrams (2 Circles)”

								
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