Dot Plot

is a graphical display of data using dots.

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Dot Plot is an organized and representation of a statistical data.

external image dot-plot-a.gif

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Dot plot

Definition of Dot plot
  • In a Dot Plot, a set of data is represented by using dots over a number line.
More about Dot plot
  • The number of dots over the number line tells the value of the data points.
Example of Dot plot
external image Dot%20plot1.jpg

  • A dot plot is as shown in the figure.
    The frequency of the data points is represented by the dots.
Solved Example on Dot plot
  • The number of various kinds of snakes found in a zoo is shown in the dot plot. What is the total number of snakes in the zoo?
external image Dot%20plot2.jpg

  • Choices:
  • A. 29
  • B. 25
  • C. 30
  • D. 34
  • Correct Answer: A
  • Solution:
  • Step 1: The number of snakes of a particular kind in the zoo is indicated by the number of dots above the name of the snake in the dot plot.
  • Step 2: From the plot, the number of Black cobras, Pythons, Anacondas, Rattlesnakes and Green cobras in the zoo are 4, 5, 2, 10 and 8 respectively. [Count the number of dots over each snake name.]
  • Step 3: The total number of snakes in the zoo = 4 + 5 + 2 + 10 + 8 = 29 [Add the number of snakes of each kind.]
  • Step 4: So, there are a total of 29 snakes in the zoo.
I choose this because it is clear to see the data points of dot plot over the line. [ Hla Htay ]