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

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

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

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

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

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

  4. Here, x’s = houses with pets

  5. Average Number of Emails • xx x x x x x___x___x_____x__________1 2 3 4 5 6Emails 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. What is the outlier here?

  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. Compare and Contrast

  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. 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. 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)

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

  17. Practice at this interactive website. • http://www.bbc.co.uk/schools/teachers/ks2_activities/maths/mode_median_mean.shtml • or Here • http://www.bbc.co.uk/bitesize/ks3/maths/handling_data/measures_average/activity/

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