Measures of Center and Spread
Find the median of this data... 0 , 4 , 6 , 3, 5, 2, 2, 7, 8, 4, 10, 5
The median is 4.5
Use the histogram on your paper.
how many total lottery winners are displayed in the graph?
30 lottery winners
Use the box and whisker plot on your paper.
What is the median of the data for 1st period?
What is the other name for "median"?
The median is 80
Another name for median is quartile 2
Use the stem and leaf plot on your paper.
How many people's data is displayed in the stem and leaf plot?
15 people
Use the dot plot on your paper.
Are there any outliers in the data?
Yes, 12 is an outlier in the data.
Find the range of the data... 14, 12, 10, 15, 18, 23, 19, 16
Use the histogram on your paper.
True or False?
More than half of the lottery winners are 50-59 years old.
False. Half of the 30 lottery winners would be 15 and the 50-59 interval only has 8 people, so that is not more than half.
Use the box and whisker plot on your paper.
What is the range of the 2nd period data?
The range is 25
Use the stem and leaf plot on your paper.
Which stem shows the peak in the data?
The 4 stem shows the peak in the data
Use the dot plot on your paper.
Are there any clusters in the data?
yes, there is a cluster from 0-4
Find the mean of the data...to the nearest tenth. 2, 10, 24, 6, 10, 12, 14, 18, 28
The mean is 13.8
Use the histogram on your paper.
How many lottery winners were at least 40?
23 lottery winners
Use the box and whisker plot on your paper.
What is the lower quartile of both class periods?
What is another name for lower quartile?
1st period: 75
2nd period: 80
Another name for lower quartile is quartile 1
Use the stem and leaf plot on your paper.
What is the range of the data?
The range is 45
Use the dot plot on your paper.
What is the shape of the data?
Left skewed, right skewed, or symmetrical?
The data is right skewed
How do you know that a situation has variability?
Provide an example and a non-example.
Situations have variability when they have a large range of possible solutions.
Examples vary
Use the histogram on your paper.
What percent of people are in the 40-49 interval?
20% of people are in the interval because there are 6 out of 30 people. 6/30=0.2=20%
Use the box and whisker plot on your paper.
What percent of the data in 2nd period is from 80 to 95?
75%
Remember: each quartile represents 25% of the data
Use the stem and leaf plot on your paper.
How many people lifted a minimum of 52 pounds?
7 people
Use the dot plot on your paper.
How many people played for atleast 4 hours?
7 people played for atleast 4 hours
What is the median of this data set: 849, 544, 899, 758, 691, 836, and 586.
The median is 758
Use the histogram on your paper.
Are there any peaks, gaps or outliers in the data?
Where?
Peak: 50-59
Gap: 0-19
Outlier: None
Use the box and whisker plot on your paper.
What is the mean of the data?
You can't determine the mean from a box and whisker plot!
Use the stem and leaf plot on your paper.
What is the median of the data?
The median is 50
Use the dot plot on your paper.
What is the mean of the data?
(Round to the nearest tenth)
Sum: 79
Total dots: 26
79/26=3.03846154
Rounds to 3