Use Line Plots to Determine Mean, Median, (使用线块确定的意思是,中位数,).pdf
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Connecting Algebra 1 to Advanced Placement* Mathematics
A Resource and Strategy Guide
Use Dotplots (Line Plots) to Determine Mean,
Median, Mode, and Range
Updated: 04/13/09
Objective:
Students will use a dotplot (a line plot) to determine mean, median, mode and range.
Connections to Previous Learning:
Students should be able to determine the mean, median, mode, and range for a set of data.
Connections to AP*:
AP Statistics Topic: Distributions – Measures of Center, Shape, and Variability
Materials:
Student Activity page, a sticky note for each student, butcher paper or chalk/white board
Teacher Notes:
Often one of the responsibilities of a Pre-AP Algebra I teacher is to search for students who have
been “missed” in order to open the gate to a wider number of students. This lesson, along with
“Analyzing Mean, Median, Mode, and Range”, is designed to provide meaningful statistical
connections during the first few days of algebra before moving on to more typical algebra activities.
While students should be able to determine measures of central tendency of data, few have used a
dotplot (line plot) to aid in determining that information. The first activity in this lesson is teacher
directed and requires a sticky note for each student. Have the student write the number of letters in
her/his last (or first) name. Have the chalk board or a piece of butcher paper pre-marked with
numbers from 3 to 12 as the number line for a dotplot. Note: A dotplot is frequently referred to as a
line plot; however, the term used AP* Statistics is always dotplot. Leave enough space between
marks for the width of the sticky plus a little. Have students come up one group (or row) at a time to
place their sticky notes in the correct column. Take some time here to let them review the arithmetic
necessary to find each measure. This activity can be done very quickly, but resist tha
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