Mean
MAD
Median
Box Plots
MYSTERY!!!!
100
Find the mean:
4, 5, 2, 1
Mean = 3
100
If the mean is 6, calculate the MAD.
MAD = 1.3333......
100
Find the median:
6, 8, 11, 5, 4, 8
Median = 7
100
Find the range:
50 - 20 = 30
100
True or False: You can use a histogram to find the median.
False! You need EXACT data. Histograms only give you ranges of data.
200
Find the mean: 20, 15, 30, 10, 25
Mean= 20
200
If the mean is 5, what is the MAD?
MAD = 3.333....
200
The colored pencils in your pencil pouch have the following lengths in inches:
3, 4, 4, 5, 7, 8, 10, 11. What is the median length?
Median = 6
200
What is the IQR?
45 - 35 = 10
200
Which would be best to use to find the RANGE?
Box plot! Gives you the exact number for the minimum & maximum.
300
Find the mean: 2, 8, 12, 1, 9, 12, 5, 7
Mean = 7
300
Which group has greater variability? How do you know?
Group A, because they have the greatest MAD.
Greater MAD = greater variability!
300
Find the median.
Median: 1
300
The box plot shows the number of minutes spent on homework in a class. What percent of the class spent 35 - 45 minutes on homework? 
25%, because it goes from minimum to Q1!
300
When is Ms. Collopy's birthday?
A. June 27th
B. July 13th
C. May 32nd
D. July 27th
D!
400
True or False: The mean is less than 8. 
TRUE!
400
Which group has less variability? How do you know? 
Group B, because they have the smaller MAD!
Smaller MAD = smaller variability
400
What is the median test score? How do you know?
85. You can find the median by looking at Q2 (middle line).
400
What is the maximum number of miles driven? How do you know?
50 miles. Find the maximum/total by looking at the maximum.
400
Find Q1!
Q1 = 23!
500
How do you find the mean?
1) ADD up all the numbers/values.
2) DIVIDE by the number of numbers/values you added!
500
How do you find the MAD?
1) Find the mean.
2) Subtract each value from the mean.
3) Find the mean of all the differences!
500
How do you find the median?
1) Line numbers up from LEAST --> GREATEST
2) Find the middle number by crossing off one-by-one from the outsides.
500
What is the difference between finding the IQR and Range?
IQR = Q3 - Q1
Range = Maximum - Minimum
500
Who is Ms. Collopy's arch nemesis?
A. Mr. Clark
B. William Clark
C. Billiam Clark
D. All of the above
