1. Bellwork Thursday, April 19th
4, 8, 6, 7, 5, 4, 10, 6, 7, 14, 12, 4, 8, 10, 15, 12
1) Find the mean 2) Find the mode
3) Find the median 4) Find the range
4, 4, 4, 5, 6, 6, 7, 7, 8, 8, 10, 10, 12, 12, 14, 15
8.25 4 11
7.5

2. the NUMBER in each category. the PERCENTAGE of each category.
Bar graphs show…
the NUMBER in each category.
Circle graphs show…
the PERCENTAGE of each category.
Line graphs show…
change over TIME.
All of the data to make these graphs usually comes from tables

3. These graphs show one or more of: shape, mean, median, mode, range
Today we’re going to graph data that looks like…
4, 8, 6, 7, 5, 4, 10, 6, 7, 14, 12, 8, 10, 15, 12
Histogram
Line Plot
Stem-and-Leaf
Box-and-Whisker
These graphs show one or more of: shape, mean, median, mode, range

4. Normal distribution (bell curve)
The shape of data can be described one of four ways:
Normal distribution (bell curve)
Bimodal (U-shaped)
Skewed to the right
Skewed to the left

5. the x-axis is always intervals
FREQUENCY
Bars HAVE to touch
Histogram
the x-axis is always intervals
What are some differences between a histogram and a bar graph?

6. (How often data occurs)
Histogram
Shows the FREQUENCY of data divided into equal intervals
(How often data occurs)
How many golfers scored between 77 and 79? 2
What score did most of the golfers get?
74-76
What score was the least common?
80-82

7. The good: The bad: You can see the shape of the data
You can’t see exact values…
No way to find mean, median, mode, or range

8. 1) Create a histogram from the data.
What type of graph should you use?
Bar graph Circle graph
Line graph Histogram
1) Create a histogram from the data.
2) Describe the shape of the data.
Interval
Frequency 2 4 3 1

9. How would you describe the shape of this data?
Interval
Frequency 2 4 3 1 4 3 2 1 x y
How would you describe the shape of this data?
Bimodal or “U” shaped

10. Line Plots The good: The bad: You can see the shape of the data
You can easily see the exact data…
which means you can find the mean, median, mode, and range
The bad:
It’s not good for large data sets

11. How would you describe the shape of this data?
Skewed to the right
Write out the numbers that are in this data set.
0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 6, 8, 10, 13, 14

12. Normal or “Bell” shaped
What type of graph should you use?
Bar graph Circle graph Line plot
Line graph Histogram
1) Create a line plot from the data.
2) Describe the shape of the data.
Normal or “Bell” shaped
Scores from last week’s quiz:
2, 4, 0, 2, 1, 3, 1, 2, 2, 3, 1, 2
1.9 2
Mean: Mode:
Median: Range: 2 4

13. Stem-and-Leaf Plots The good: The bad:
You can see the shape of the data
You can easily see the exact data…
which means you can find the mean, median, mode, and range
The bad:
It’s ugly

14. Normal or “Bell” shaped
Describe the shape of the data.
Normal or “Bell” shaped

15. The temperature in degrees Celsius for two weeks are given below
The temperature in degrees Celsius for two weeks are given below. Use the data to make a stem-and-leaf plot.
7, 32, 34, 31, 26, 27, 23, 19, 22, 29, 30, 36, 35, 31
Temperature in Degrees Celsius
Stem Leaves
0 7
1 9

16. Describe the shape of the data. Find the mean, median, mode and range.
Temperature in Degrees Celsius
Temperature in Degrees Celsius
Describe the shape of the data.
Stem Leaves
0 7
1 9
Stem Leaves
0 7
1 9
Stem Leaves
0 7
Skewed to the left
1 9
Find the mean, median, mode and range. 27 31
Mean: Mode:
Median: Range:
29.5 29