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
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