4[1].4central Tendencies

Measures of Central Tendencies

Mean Average

Mode Average

Median Average

Range

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.

If you were the boss, what would you do?

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.

Only 2/5 of all absences

in this company occur on

Mondays or

Fridays

If you were the boss, how would you feel?

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

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

• Total : 48

48 10 4.8

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 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

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

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

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

Answers

• Mean = 17

• Median = 18

• Mode = 19

• Range = 17

6

12

15

16

17

18

19

19

19

23

23

Assignment

• Page 190:

44 -53; 54, 56