1. 1 Math Review: line plots, bar graphs, mean, median, mode, range Block 4 – Math

2. 2 What is a line plot?  A line plot displays data along a number line.  Each x represents one number in the data.

3. 3 Outlier  A number in a data set that is very different from the other numbers.

4. 4 Here, x’s = houses with pets

5. 5 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?

6. 6 What is the outlier here?

7. 7 What is a bar graph?  A bar graph is a graph using bars to show data.  Bar graphs can be vertical or horizontal.

8. 8 Compare and Contrast

9. 9 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.  The interval is 5.  The graph must have labels!

10. 10 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.

11. 11 Make a bar graph.  http://nces.ed.gov/nceskids/graphing /classic/bar_pie_data.asp?ChartType =bar http://nces.ed.gov/nceskids/graphing /classic/bar_pie_data.asp?ChartType =bar  Y axis – vertical (up and down)  X axis – horizontal (across)

12. 12 What is the Median?  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.

13. 13 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.

14. 14 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.

15. 15 What is the mean?  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.

16. 16 Mean  The blocks  that are all  the same  height show  the average  or mean.

17. 17 Practice at this interactive website.  http://www.bbc.co.uk/schools/teache rs/ks2_activities/maths/mode_media n_mean.shtml http://www.bbc.co.uk/schools/teache rs/ks2_activities/maths/mode_media n_mean.shtml  or Here  http://www.bbc.co.uk/bitesize/ks3/m aths/handling_data/measures_averag e/activity/ http://www.bbc.co.uk/bitesize/ks3/m aths/handling_data/measures_averag e/activity/