Measures of Center and Variation

calculate the median for the following set of scores

45, 69, 69, 87, 88, 92, 99, 100

• 87

• 55

• 87.5

• 99

Calculate the range of the following

2, 5, 8, 3, 13, 5

• 11

• 13

• 5

• 8

find the lower quartile of the following set of scores

12, 9, 4, 6, 5, 8, 9, 4, 10, 2

• 10

• 4

• 9

• 6

Calculate the interquartile range of the following data

• 3

• 4

• 5

  
  

• 8

  
  

The frequency table shows the gas mileages of several vehicles. The data would be ​ (a)   so the best measure of center would be the ​ (b)   and the best measure of variation would be the ​ (c)   ​ ​

• Skewed Right

• median

• Interquartile Range

• Skewed Left

• Symmetrical

• Mean

• Mean Absolute Deviation

Find the range.
12, 5, 9, 18, 22, 25, 5

• 20

• 15

• 22

• 18

Find the mean.
90, 100, 95, 85, 60, 80

• 85

• 84

• 86

• 90

Find the median.
12, 5, 9, 18, 22, 25, 5

• 9

• 8

• 12

• 18

The number of pages that Carolyn wrote in her journal each day from Monday to Friday is shown below: 
9, 8, 12, 6, 10
What is the mean number of pages she wrote per day?

• 5

• 6

• 9

• 11

Find the interquartile range using the following data.
18, 15, 22, 16, 17, 15, 12, 22, 13

• 34

• 16

• 6

• 10