Measures of Center and Spread to Analyze Data

Find the Mean Absolute Deviation for the following data set:

58, 38, 54, 48, 26, 36

• 43

• 20

• 10

• 12

What is the mean?

• The number that occurs the most

• The number in the middle

• The difference between the highest and lowest values

• The Average

What is the median?

• The number in the middle, when arranged from least to greatest

• The difference between the highest and lowest values

• The number that occurs the most

• The average

When finding the median what is the FIRST step?

• Mark off the lowest number

• Mark off the highest number

• Find the middle

• Arrange the numbers from least to greatest

What is the median of this data?
0, 2, 4, 6, 8, 9

• 5

• 4

• 6

• 4.5

Find the mean of these numbers:
2, 57, 38, 42, 6

• 29

• 38

• 50

• 145

The number of pages that Kate wrote in her journal each day 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 mean.
90, 100, 95, 85, 60, 80

• 85

• 84

• 86

• 90

When finding the median, what do you do if there are two middle numbers?

• Add them together and divide by 2

• Write them both as the answer

• Give up

• Pick one

Find the median:
5, 6, 3, 9, 0, 4, 1, 2, 7

• 4

• 4.1

• 5

• 4.5