Measures of Variability (IQR and MAD)

What is the first quartile:

25, 25, 29, 31, 33, 37, 38, 42, 46

• 25

• 27

• 29

• 33

What is the 3rd quartile:

25, 25, 29, 31, 33, 37, 38, 42, 46

• 37

• 38

• 40

• 46

What is the IQR:

25, 25, 29, 31, 33, 37, 38, 42, 46

• 8

• 9

• 13

• 21

If the mean of these numbers' is 34, what is the MAD:

25, 25, 29, 31, 33, 37, 38, 42, 46

• 6

• 9

• 21

• 34

What is the first quartile:

7, 5, 10, 9, 15, 12, 6, 9, 7, 10

• 6

• 7

• 9

• 10

What is the 3rd quartile:

7, 5, 10, 9, 15, 12, 6, 9, 7, 10

• 9

• 10

• 11

• 15

What is the IQR:

7, 5, 10, 9, 15, 12, 6, 9, 7, 10

• 9

• 10

• 5

• 3

If the mean for these numbers' is 9, what is the MAD:

7, 5, 10, 9, 15, 12, 6, 9, 7, 10

• 2.2

• 2

• 1.75

• 3

Find the IQR (Hint: find the quartiles first):

1, 5, 7, 8, 4, 2, 6, 8, 10

• 1

• 3

• 5

• 6

FInd the MAD (Hint: find the mean, then the absolute deviations, then the MAD):

5, 8, 12, 15, 18, 20

• 3.75

• 4.666666666

• 5.3

• 6.111111111