# Math Review line plots, bar graphs, mean, median, mode,

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```					Math Review: line plots, bar
graphs, mean, median, mode,
range

V. Martinez

1
What is a line plot?
 A line plot displays data along a
number line.
 Each x represents one number in the
data.

2
Outlier
 A number in a data set that is very
different from the other numbers.

3
Here, x’s = houses with pets

4
Average Number of Emails
   x
x
x
x   x     x
x___x___x_____x__________
1   2    3 4 5 6
Emails sent today


What is the average number of emails sent today?
   Remember to find the average : ADD and Divide

   What is the range?
   What is the mode?
   What is the median?

5
What is the outlier here?

6
What is the Median?       text pg. 226

 The median is the middle number
when the data are listed in order.

 The number of raisins in our boxes:
 10, 26, 26, 27, 30, 32, 32, 32, 34

           x
30 is the median.
7
What is the mode?
 The mode is the number or numbers
that occur most often in the data.

10, 26, 26, 27, 30, 32, 32, 32, 34

The mode is 32.

8
What is the range?
 The range is the difference between
the greatest and the least number in
the data.
 10, 26, 26, 27, 30, 32, 32, 32, 34

 The greatest number is 34. The least
number is 10.
 34 – 10 = 24. The range is 24.
9
What is the mean?      Pg. 404

 The mean is the average. It is found
by adding all the numbers in a set
and dividing by the number of values.
 10, 25, 20, 5, 20
 The sum is 75.
 Divide 75 by 5.
 The average or mean is 15.
10
Mean
   The blocks
   that are all
   the same
   height show
   the average
   or mean.

11
Practice at this interactive website.
 http://www.bbc.co.uk/schools/ks2bit
esize/maths/activities/modemedianm
ean.shtml

 Or here:
 http://www.manatee.k12.fl.us/sites/e
lementary/palmasola/mathlabtutstat1
.htm

12
What is a bar graph?        p 208

 A bar graph is a graph using bars to
show data.
 Bar graphs can be vertical or horizontal.

13
Compare and Contrast

14
Parts of a bar graph

 Scale: Numbers that show the units
used on a graph are the scale.(The numbers
on the graph.)

 Interval: a number which is the
difference between two consecutive
numbers on the scale of a graph. (p. 208)
   The interval is 5.
 The graph must have labels!

15
Steps for creating a bar graph.
 Choose a scale.
 Draw and label the side and bottom
of the graph.
 Draw a bar on the graph for each
piece of data.
 Give the graph a title. The title shold
describe the subject of the graph.

16
Make a bar graph.
 http://nces.ed.gov/nceskids/graphing
/classic/bar_pie_data.asp?ChartType
=bar

 Y axis – vertical (up and down)
 X axis – horizontal (across)

17

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