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Measures of Central Tendencies Mean Average Mode Average Median Average Range

4.4central Tendencies

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Page 1: 4.4central Tendencies

Measures of Central Tendencies

Mean Average

Mode Average

Median Average

Range

Page 2: 4.4central Tendencies

New Data Relates to Loss in Productivity

40% of all absences- due-to-illness in the work place occur on Mondays and Fridays reducing effectiveness of the business staff.

Page 3: 4.4central Tendencies

If you were the boss, what would you do?

Page 4: 4.4central Tendencies

You can say anything with numbers

• 1 day = 1/5 or 20% of the work week.

• 2 days = 2/5 or 40%

• Would you expect illnesses’ absences to occur equally during the week?

• You can make the same statistics sound positive or negative.

Page 5: 4.4central Tendencies

Only 2/5 of all absences

in this company occur on

Mondays or

Fridays

If you were the boss, how would you feel?

Page 6: 4.4central Tendencies

A Review

• Mean

• Median

• Mode

Order the numbers from least to greatest.

The number that occurs in the middle is the median;

the one that occurs the MOST is the mode

*Total the numbers*Divide by the number of data

Page 7: 4.4central Tendencies

Find the mean• 2• 5• 3• 6• 12• 9• 1• 4• 2• 4

• Total : 48

48 10 4.8

Page 8: 4.4central Tendencies

Find the median and mode

• Line up the numbers in chronological order

• Mean : 4.8• Median:• Mode:

2

5

3

6

12

9

1

4

2

4

Page 9: 4.4central Tendencies

Find the median and mode

• Line up the numbers in chronological order

• Mean : 4.8• Median:• Mode:

2

5

3

6

12

9

1

4

2

4

Find the middle of the list.

4

Page 10: 4.4central Tendencies

Find the median and mode

• Line up the numbers in chronological order

• Mean : 4.8• Median:• Mode:

2

5

3

6

12

9

1

4

2

4Find the number or numbers that occur the most often.

4

2 an 4

Page 11: 4.4central Tendencies

Find the range

• Mean : 4.8• Median:• Mode:

• Range:

2

5

3

6

12

9

1

4

2

4Subtract the lowest from the highest number

4

2 an 4

12 – 1= 11

Page 12: 4.4central Tendencies

Find the mean, median, mode, and range

16

23

19

6

15

17

18

12

19

23

19

6

12

15

16

17

18

19

19

19

23

23

Page 13: 4.4central Tendencies

Answers

• Mean = 17

• Median = 18

• Mode = 19

• Range = 17

6

12

15

16

17

18

19

19

19

23

23

Page 14: 4.4central Tendencies

Assignment

• Page 190:

44 -53; 54, 56