## Mean and Median

Data points can also be created or modified by entering numbers in the text
boxes below the number line. The **apply** button must be used to activate
any changes. If the data points are out of order, the **sort** button can be
used to order them from least to greatest. The **clear** button can be used
to remove all data points.

Up to three number lines can be made active with the **activate** feature.
The data points from one number line can be transferred to an adjacent number
line using the **copy** function. At any time, a data set can be hidden with
the **deactivate** feature.

- Set A: Every data point is between 35 and 65.
- Set B: Every data point is either less than 25 or greater than 75.
- Set C: The difference between every pair of two consecutive data points is the same.

How are these sets different from one another? How are they alike? Are there other data sets with 6 points, a mean of 50, and a median of 50 that look different from the three you've created?