bargraphandhistograms

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Slide 1  Pet Popularity
 Type of pet
 Number of Students
 Parakeet
 Dog
 Cat
 Hamster
 60
 50
 40
 30
 20
 10
 0
 About 10% of the students have a Parakeet as a pet.

Slide 2  A histogram is a bar graph that shows the frequency of data within equal intervals. There is no space between the bars in a histogram.
 Course 2
 73
 Histograms

Slide 3  The list below shows the length of the right arm of students in Mrs. Alvarez’s math class. Make a histogram of the data.
 Example:
 Step 1: Make a frequency table of the data. Divide the data into 4 to 6 equal intervals.
 Course 2
 73
 Histograms
 18, 21, 21, 18, 22, 19, 17, 21, 28, 23, 25, 26, 24, 25, 24, 20, 26, 24, 20
 Interval
 Tally
 Frequency
 1719
 2022
 2325
 2628

Slide 4  The list below shows the length of the right arm of students in Mrs. Alvarez’s math class. Make a histogram of the data.
 Example:
 Step 1: Make a frequency table of the data. Divide the data into 4 to 6 equal intervals.
 Course 2
 73
 Histograms
 18, 21, 21, 18, 22, 19, 17, 21, 28, 23, 25, 26, 24, 25, 24, 20, 26, 24, 20
 Interval
 Tally
 Frequency
 1719
 llll
 4
 2022
 llll l
 6
 2325
 llll l
 6
 2628
 lll
 3

Slide 5  Step 2: Choose an appropriate scale and interval for the vertical axis (frequency). The greatest value on the scale should be at least as great as the greatest frequency.
 10
 8
 6
 4
 2
 0
 Course 2
 73
 Histograms
 Interval
 Tally
 Frequency
 1719
 llll
 4
 2022
 llll l
 6
 2325
 llll l
 6
 2628
 lll
 3

Slide 6  Step 3: Draw a bar graph for each interval. The height of the bar is the frequency for that interval. Bars must touch but not overlap.
 Course 2
 73
 Histograms
 Because the intervals are equal, all of the bars should have the same width.
 Caution!
 Interval
 Tally
 Frequency
 1719
 llll
 4
 2022
 llll l
 6
 2325
 llll l
 6
 2628
 lll
 3
 10
 8
 6
 4
 2
 0

Slide 7  Step 4: Label the axes and give the graph a title.
 1719 2022 2325 2628
 Lengths of Right Arms
 Frequency
 Inches
 Course 2
 73
 Bar Graphs and Histograms
 10
 8
 6
 4
 2
 0
 Don’t forget your T.A.I.L.S.