Lesson 13: More Standard Deviation
About this lesson
One purpose of this lesson is to introduce students to the Info Gap routine. Students deepen their understanding of standard deviation by interpreting it in various contexts. Students expand on the work from previous lessons by seeing the standard deviation in various contexts. The work of this lesson connects to upcoming work because students will continue to examine how variability, along with the context of a problem, can help determine whether data are outliers and what to do with these values.
Interpreting standard deviation in context is evidence that students are reasoning abstractly and quantitatively (MP2). The information gap activity may take students several rounds of discussion to make sense of and gain the information they need to solve the problem (MP1). The information gap structure also allows them to refine the language they use and ask increasingly more precise questions until they get the information they need (MP6).
Lesson overview
 13.1 Warmup: Math Talk: Outlier Math (5 minutes)
 13.2 Activity: Info Gap: African and Asian Elephants (30 minutes)

13.3 Optional Activity: Interpreting Measures of Center and Variability (10 minutes)
 Includes "Are you Ready for More?" extension problem
 Lesson Synthesis
 13.4 Cooldown: Majors and Salaries (5 minutes)
Learning goals:
 Describe (orally and in writing) the meaning of standard deviation in context.
Learning goals (student facing):
 Let’s continue to interpret standard deviation.
Learning targets (student facing):
 I can use standard deviation to say something about a situation.
Required materials:
 Preprinted slips, cut from copies of the blackline master
Required preparation:
 Print and cut up slips from the blackline master. Prepare 1 copy for every 2 students.
Standards:
 This lesson builds on the standard: CCSS.HSSID.A.1MS.SID.1MO.A1.DS.A.1
 This lesson builds towards the standard: CCSS.HSSID.A.3MS.SID.3MO.A1.DS.A.3
IM Algebra 1, Geometry, Algebra 2 is copyright 2019 Illustrative Mathematics and licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0).
The Illustrative Mathematics name and logo are not subject to the Creative Commons license and may not be used without the prior and express written consent of Illustrative Mathematics.