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Math Review line plots, bar graphs, mean,

median, mode, range

- V. Martinez

What is a line plot?

- A line plot displays data along a number line.
- Each x represents one number in the data.

Outlier

- A number in a data set that is very different

from the other numbers.

Here, xs houses with pets

Average Number of Emails

- xx 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?

What is the outlier here?

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.

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.

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.

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.

Mean

- The blocks
- that are all
- the same
- height show
- the average
- or mean.

Practice at this interactive website.

- http//www.bbc.co.uk/schools/ks2bitesize/maths/act

ivities/modemedianmean.shtml - Or here
- http//www.manatee.k12.fl.us/sites/elementary/palm

asola/mathlabtutstat1.htm

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.

Compare and Contrast

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!

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.

Make a bar graph.

- http//nces.ed.gov/nceskids/graphing/classic/bar_p

ie_data.asp?ChartTypebar - Y axis vertical (up and down)
- X axis horizontal (across)