# Mean, Median or Mode?

*Mean*,

*median*and

*mode*are called

*measures of central tendency*because in general their values tend to be near the center of the distribution. These "measures" also describe the magnitude of data using a single value, instead of the whole dataset. Explore the app below, then press the

*Reset*button next to the number line and start over with the guided explorations described below the applet.

## What Is That Segment?

When at least two distinct points are in the dot plot, a segment on the number line appears. What do the length and endpoints of that segment mean for the distribution? Move the points in the dot plot and try to obtain the longest segment possible. Is the length of the segment influenced by the points in the middle of the distribution?

## Activity 1

Use the app above to create a dot plot such that the *mean*, the *median *and the *mode *of the dataset are all the same.
Do you notice a pattern in the distribution of points in the plot?
Explain your answer.

## Activity 2

Use the app above to create the dot plot of the following data set: , then calculate the *mean* of the data set and check if your result is correct by displaying its value in the app.
Do you think that the mean can be representative of this data set?
Explain your answer.

## Activity 3

*bimodal*dataset. Note:

*Bimodal*means "with two modes".