central tendency

1. Mean Median Mode Range
Measures of Central Tendency
Any of three measures (mean, median, mode) that represents a type of average of a set of data

2. Mean
The mean is the mathematical average of a set of
numbers.
The mean is commonly referred to as the “average”.
The mean is easy to calculate.
Measures of Central
Tendency
MEAN = sum of values
number of values

3. Calculate the Mean
Find the mean of the data set.
1, 5, 3, 7, 3, 3, 6 (Seven Items)
1 + 5 + 3 + 7 + 3 + 3 + 6 = 28 Add all Values
28 ÷ 7 = 4 Divide the sum by the number of items.
The mean price of the candy is 4.
Measures of Central
Tendency
MEAN = sum of values
number of values

4. Median
The median is the middle value of a set of data.
Measures of
Central Tendency
ODD set of values EVEN set of values
1 3 4 6 7 1 3 4 6 7 8
Median is 4 4 + 6
2
Median is 5
10
2
= = 5
Arrange the values in ascending order.
There is one middle value, so find the
mean of these values.
There are two middle values, so find
the mean of these values.
1 3 4 6 7
1 4 3 7 6 1 4 3 7 6 8
Arrange the values in ascending order.
1 3 4 6 7 8

5. Calculate the Median
Find the median of the data set.
1, 5, 3, 7, 3, 3, 6
1 3 3 3 5 6 7 Arrange the values in order.
1 3 3 3 5 6 7
The median price of the candy is 3.
There is one middle value, so find the mean of these values.
Measures of Central
Tendency

6. Mode
Measures of Central
Tendency
The mode is the number that occur most often in a
set of data.

7. Mode
Measures of Central
Tendency
Find the mode of the data set.
1, 5, 3, 7, 3, 3, 6
The number 3 is the mode because it is the score
that occurs the highest number of times.

8. Range
Measures of Central
Tendency
The range is the difference between the least and
greatest value in the set.

9. Measures of Central
Tendency
Find the range of the data set.
1, 5, 3, 7, 3, 3, 6
7 is the greatest value and 1 is the least value
Range
Subtract the least value from the greatest value
7
- 1
The range price of the candy is 6.
6