Measures of Center and Measures of Variation

Find the mean of these numbers:

2, 57, 38, 42, 6

• 29

• 38

• 50

• 145

What is the first step when calculating the Mean Absolute Deviation?

• Find the distance each value is from the mean

• Find the mean of the distances

• Find the mean of the data

What is the third step when calculating the Mean Absolute Deviation?

• Find the distance each value is from the mean

• Find the mean of the distances

• Find the mean of the data

Find the Mean Absolute Deviation: 10, 9, 3, 8, 10. The Mean is 8

• 3

• 5

• 1

• 2

Which mean absolute deviation would have a greater variability or spread? 4.2 or 8.5?

• 4.2

• 8.5

Which dot plot shows more consistency? a or b?

• a

• b

How do you find the Interquartile Range?

• divide the 3rd quartile by the 1st quartile

• subtract the biggest number by the smallest number

• divide the biggest number by the smallest number

• subtract the 3rd quartile by the 1st quartile

Roger bowled 7 games last weekend. His scores are: 155, 165, 138, 172, 127, 193, 142. What is the range of Roger's scores?

• 193

• 127

• 60

• 66

What is the IQR?

• 5.5

• 4

• 4.5

• 6

Which car club has the higher median?

• Cruisers

• Car Hops