1. Measures of Central Tendency
Mean, Median and Mode

2. Finding Mean, Median and Mode
Step 1: Organize your data by listing it from the smallest to largest number!
(13, 12, 8, 10, 5, 13, 14)
(5, 8, 10, 12, 13, 13, 14)

3. Mean
The mean of the data set is its average. To find the mean you add up all the numbers and divide the answer by how many numbers you have.
(5, 8, 10, 12, 13, 13, 14)
Mean = 10.71

4. Median
The Median is the number which is in the exact middle of the data set.
(5, 8, 10, 12, 13, 13, 14)
Median = 12

5. Mode
The Mode is the number that appears the most often if you are working with only one variable.
(5, 8, 10, 12, 13, 13, 14)
Mode = 13

6. ON YOUR OWN
Find the mean, median, and mode for the following data set.
(4, 8, 6, 10, 4, 2)

7. Measures of Variability (Dispersion)
Range,
Interquartile Range
and the Mean Absolute Deviation

8. Range
The range of the data set is the difference between the largest and smallest number in the set. To find the range, you simply subtract the smallest number from the largest number in the set.
(5, 8, 10, 12, 13, 13, 14)
Range = 14-5=9

9. Mean Absolute Deviation
The mean absolute deviation of a numerical data set is the average deviation of the data from the mean.

10. Mean Absolute Deviation
The numbers below are the golf scores for the UGA golf team. Find the mean absolute deviation of the data.
68, 70 , 72, 73, 74, 75
Mean = 72
Do the same for Georgia Tech: 66, 69, 70, 71, 74, 76