Measures of Spread

What is the range?

• average
• biggest-smallest
• the middle #
• # happening the most

Find the range of the data.

63, 71, 65, 66, 87, 53

• 32

• 33

• 34

• 35

Find the range of the data.

16, 28, 6, 19, 21, 15, 22, 33, 17

• 18

• 27

• 30

• 12

What is the range?

• 6

• 2 - 8

• 3

• 4

Find the interquartile range using the following.
Minimum:  1
Q1:  3
Median:  5
Q3:  7
Maximum:  9

• 8
• 4
• 5
• 10

Find the IQR (interquartile range) using the following information.
Minimum:  77
Q1:  79.5
Median:  86.5
Q3:  90.5
Maximum:  99

• 86.5
• 22
• 90.5
• 11

Find the interquartile range using the 5 number summary.
Minimum:  2
Q1:  3.5
Median:  6
Q3:  10.5
Maximum:  12

• 7
• 10
• 4.5
• 8.5

Find the interquartile range using the following data

4, 4, 4, 4, 5, 6, 7, 7, 7

• 3

• 1.5

• 2

• 6

Find the interquartile range using the following data.

12, 13, 15, 15, 16, 17, 19, 21, 22

• 34

• 16

• 6

• 10

Find the IQR using the following data.

50, 60, 82, 86, 94, 110

• 60

• 84

• 34

• 50