1. are two in the middle, find their average.
Measures of Central Tendency
MEAN –
MEDIAN –
MODE –
Range –
Outlier –
Mean, Median and Mode Song
Tune – “Row, Row, Row Your Boat”
the average
Use the mean to describe the middle of a set
of data that DOES NOT have an outlier.
Mode, mode, mode the most
Average is the mean
Median, median, median,
median’s always in between
the middle value in the set when the numbers are arranged in order. If there
are two in the middle, find their average.
Use the median to describe the middle of a set of data
that DOES have an outlier.
the data item that occurs the most times. It is possible for a
set of data to have no mode, one mode, or more than one mode.
Use the mode when the data are nonnumeric or when choosing the most popular item.
the difference between the greatest and the least data value.
The range gives you a measure of the spread of data.
a data value that is much higher or lower
than the other data values in the set.

2. 1. Find the mode of the data set: 2, 5, 7, 8, 9
3. Find the mean, median and mode of the data , 10, 16, 11, 20, 19, 18, 16, 10, 16
4. What is the difference between the mean and the median in the data set in #3?
5. How does the outlier affect the range in the set of data? 5, 6, 7, 7, 7, 8, 9, 15