Lesson: Outliers of a Data Set Mathematics • 8th Grade

In this lesson, we will learn how to identify outliers from a data set.

Lesson Plan

Students will be able to

understand what an outlier of a data set is,
identify the outliers using the definition in case of evident outliers given graphically,
understand what anomalies are and why they should be removed from the data and then recompute the mean or standard deviation of the data set without the anomalies,
identify outliers of a data set by using the 1.5 IQR rule,
identify outliers of a data set by using the 2 standard deviation rule.

Lesson Video

Lesson Explainer

Lesson Playlist

03:15
02:03
+2

00:59

Lesson Worksheet

Q1:

The table below shows the number of messages exchanged on the smart phones of 14 students over a single month. The data have also been plotted in a dot plot.

Are there any outliers in this data set? If so, specify the value or values of these outliers.

Q2:

The bar graph shows the prices of six different jackets. Which price is an outlier?

Q3:

Which of the statements is correct for the distribution represented by the diagram?