Do Now:
Find the mean absolute deviation (MAD) of the
following set of data:
Mean:
Distance from Mean:
MAD:
Students will compute the
interquartile range (IQR) of a
distribution
Quartile: values that divide the
distribution into four equal groups
Interquartile Range (IQR): the distance
between the first and third quartiles
Look back at the project grades.
70 (quartile 1)
90 (quartile 3)
60, 65, 70, 75, 80, 80, 85, 90, 95, 100
80 (the median)
60, 65, 70, 75, 80, 80, 85, 90, 95, 100
What is the IQR of this class’ project grades?
Quartile 3 – Quartile 1 = IQR
90 – 70 = 20
IQR = 20
You Try:
You Try:
70
90
20
90 – 70 = 20
60, 70, 70, 80, 80, 80, 80, 90, 90, 100
You Try:
You Try:
75
85
85 – 75 = 10
10
75, 75, 75, 80, 80, 80, 80, 85, 85, 85
You Try:
Reflections:
60, 65, 70, 75, 80, 80, 85, 90, 95, 100
Homework:
IQR worksheet