Free Online Math Worksheet - Data

Name:_________________________

Mean, Median and Mode - Data, Outliers and Sample Size

Calculate each mean, median and mode, correct to one decimal place.

Data Set A:

Mean = ______

Median = ______

Mode = ______

Data Set B:

Mean = ______

Median = ______

Mode = ______

Data Set C:

Mean = ______

Median = ______

Mode = ______

Data Set D:

Mean = ______

Median = ______

Mode = ______

What is the difference between Data Set A and Data Set B?
For A and B, which are most different, their means, medians or modes?
What is the difference between Data Set A and Data Set C?
What is the difference between Data Set C and Data Set D?
Compare the change in the means of A and B to the change in the means of C and D.

A single, much larger number has been added to A to make B.
The means are the most different.
The numbers in A and C are similar, in fact, the same, but Set C is much larger than (3 times as large as) Set A.
A single, much larger number has been added to C to make D.
For the smaller sets, A and B, the mean changes more when an extreme value is added, than for the larger sets. The larger the sample size, the less the mean will be affected by an extreme value.