The document defines several measures of central tendency: mean, median, mode, and range. It provides examples to show how to calculate each measure and explains their meanings. The mean is the average found by adding all values and dividing by the number of values. The median is the middle number when values are in numerical order. The mode is the value that occurs most frequently. The range is the difference between the highest and lowest values.

2. A measure of central tendency is a
univariate statistic that indicates, in one
manner or another,
•the average or typical observed value of a
variable in a data set, or
•put otherwise, the center of the frequency
distribution of the data.

3. Mean is the average of a
set of data. To calculate
the mean, find the sum of
the data and then divide by
the number of data.

4. What is the MEAN?
How do we find it?
•The mean is the
numerical average of the
data set.
•The mean is found by
adding all the values in
the set, then dividing the
sum by the number of
values.

5. 97
84 Add all the
Lets find Abby’s 88 values.
MEAN science test
100
score?
95
63
Divide the
73 sum by the
783 9 86
÷ + 97
number of
values.
The mean is 87 783

6. Median is the middle
number in a set of data
when the data is
arranged in numerical
order.

7. How to find the MEDIAN
when two numbers are in
the middle?
1. Add the two
numbers.
2. Then divide by 2.

8. Arrange values from least to greatest.
63 73 84 86 88 95 97 97 100
Find the number that is in the middle.
The median is 88.
Half the numbers are
Half the numbers are
less than the median. greater than the median.

9. A Hint for
remembering the
MODE…
The first two The mode is the
letters give you a number that occurs the
hint… MOde most.
Most Often

10. What is the MODE?
How do we find it?
The MODE is the piece of
data that occurs most
frequently in the data
set.
A set of data can have:
One mode
More than one mode
No mode

11. Arrange the values from least to greatest.
63 73 84 86 88 95 97 97 100
Find the number that appears most or more
frequently.
The value 97 appears twice.
All other numbers appear just once.
97 is the MODE

12. Mean The average
The number or average
Median of the numbers in the
middle
Mode The number that
occurs most

13. What is the RANGE?
How do we find it?
The RANGE is the
difference between
the lowest and
highest values.

14. Arranging values from least to greatest
makes it easier to find the RANGE.
63 73 84 86 88 95 97 97
Subtract the lowest value from the highest.
97 34 is the RANGE
-63 or spread
34 of this set of data