Ch. 9 Review (6th Grade)

9.1: Dot Plots

100

What are three features of dot plot data?

Clusters, peaks, gaps

200

The data values are: 

3, 4, 5, 5, 5, 6, 6, 7, 9, 9

What is the peak?

5

300

The data values are: 

3, 4, 5, 5, 5, 6, 6, 7, 9, 9

What is cluster and what is the gap?

Cluster: 3-7

Gap: 7-9

400

The data values are:

 2, 5, 7, 14, 13, 10, 10, 10, 9, 9, 8, 2, 3

What is the peak?

10

500

The data values are:

 2, 5, 7, 14, 13, 10, 10, 10, 9, 9, 8, 2, 3

What is/are the clusters (more than one value)?

What is/are the gaps?

Cluster: 2-3, 7-10, 13-14

Gap: 3-5, 5-7, 10-13

9.2: Mean

100

How do you find the mean?

Add together the values and divide by the number of values.

200

Find the mean:

4, 5, 7, 5, 9, 9, 10, 6

6.875

300

Find the mean:

5, 6, 4, 24, 18

11.4

400

42, 59, 78, 65, 68

62.4

500

Find the mean:

40, 45, 62, 40, 30, 32, 38

41

9.3: Median and Mode

100

How do you find the median?

Put the numbers in order and find the number in the middle

200

What is the mode?

The number that appears most.

300

Find the Median:

4, 5, 7, 5, 9, 9, 10, 6

6.5

400

Find the mode:

4, 5, 7, 5, 9, 9, 10, 6

9 and 5

500

Find the median and the mode:

5, 6, 4, 24, 18

Median:6

Mode: none

9.4: Range and IQR

100

What does IQR stand for?

Interquartile Range

200

How do you find the range?

Subtract the smallest value from the greatest value.

300

What is the range? 

4, 5, 7, 5, 9, 9, 10, 6

₆

400

What is the IQR?

32, 58, 19, 36, 44, 57, 11, 26, 74

35

500

What is Q₁ and Q₃?

36, 24, 49, 32, 37, 28, 38, 40, 39

Q₁ = 30

Q3 = 39.5

9.5: MAD

100

What does MAD stand for?

Mean Absolute Deviation

200

Find the mean absolute deviation:

(Round to the nearest hundredth)

4, 5, 6, 7, 8, 9, 10

1.71

300

Find the MAD from these years:

2010, 2002, 2005, 2007, 2001

2.8 years

400

Find the MAD: (round to the nearest hundredth)

3, 5, 6, 10, 11, 12, 12, 13

2.89

500

Find the MAD: (round to nearest hundredth)

45, 65, 34, 55, 54, 58, 53

7.14