Math Review: line plots , bar graphs, mean, median, mode
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Transcript Math Review: line plots , bar graphs, mean, median, mode
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.
We added 5 numbers.
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
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