Name________________________

 

COMPARING AVERAGES GRAPHICALLY #1--KEY

 

 

Directions: Find the mean, median, mode, and range for each stem and leaf plot below. Remember, in a stem and leaf plot 6|3 means 63.  For example, in the first plot, Chris’ lowest score is 71, and Cody’s lowest score is 70. 

 

Mean is the sum of the data divided by the number of data points.  Median is the middle data point of the ordered data.  Mean is the sum of the data divided by the number of data points.  Mode is the data point(s) that appears the most.  Range is the difference between the largest data point and the smallest data point. 

 

Round all of your answers to the nearest tenth.                                                                                                                                            

 

Chris

Test Scores

Cody

 

6

 

4 3 2 1

7

0 6 8 8

5 5

8

1 8

9 7 5

9

5 7 9

0 0

10

0 0

Chris:           Mean _86.5__     Median__85_  Mode 85 & 100           Range_29__

 

 

 

Cody:          Mean _87.5__     Median_88__  Mode 78 & 100           Range_30__

 

 

 

 

 

 

 

Joseph

Points Scored

Jennifer

 9 6 3

1

1 3 6

4 2 0 0

2

0 6 8 8

5 5

3

1 8

8 7 5

4

5 7

1

5

 

Joseph:        Mean _30.4__      Median_20__  Mode 20 & 35   Range_38_

 

 

 

Jennifer:      Mean _27.6__     Median_28__  Mode_28__       Range_36_

 

 

 

 

 

 

 

Tiffany

$$ Earned

Terry

 1 1 1

6

0 2

0

7

0

5

8

1 8

9 7 5

9

5 7 9

0 0

10

0

                    Tiffany:   Mean _82.9__ Median_90__  Mode_61__     Range_39_

 

 

 

                    Terry:       Mean _83.6__ Median_88__  Mode None     Range_40_