Lesson 12-1 Pages 606-611

Stem-and-Leaf Plots

What you will learn!1. How to display data in stem-and-leaf plots.

2. How to interpret data in stem-and-leaf plots.

Stem-and-leaf plotStem-and-leaf plotStemsStemsLeavesLeavesBack-to-back stem-and-leaf Back-to-back stem-and-leaf plotplot

What you really need to know!

One way to organize and display data is to use a stem-and-leaf plot. In a stem-and-leaf plot, numerical data are listed in ascending or descending order.

What you really need to know!

Stem Stem

LeafLeaf

00 5 5 5 65 5 5 6

11 0 0 0 0 1 2 2 5 8 8 90 0 0 0 1 2 2 5 8 8 9

22 1 2 5 81 2 5 8

33 00 2 │5 = 25

Example 1:

Display the data on the following slide in a stem-and-leaf plot.

Peanuts Harvested, 2001Peanuts Harvested, 2001

StateState Amount (lb)Amount (lb)

AlabamaAlabama 24002400FloridaFlorida 28002800GeorgiaGeorgia 28002800New MexicoNew Mexico 24002400North CarolinaNorth Carolina 29002900OklahomaOklahoma 22002200South CarolinaSouth Carolina 29002900TexasTexas 26002600VirginiaVirginia 30003000

Stem Stem

LeafLeaf

22 2 4 4 6 8 8 9 92 4 4 6 8 8 9 933 00

2 │4 = 2400 lb

The stem-and-leaf plot lists the percent of voters in each state that voted for U.S. representatives in 1998.

0 1

Which interval contains the most percentages? 30 -39

0 1

What is the greatest percent of voters that voted for U.S. representatives?

59%0 1

What is the median percent of voters that voted for U.S. representatives?

37.5%0 1

Which state produces more honey?

California at 45

million pounds.

Which state has the most varied production?

California. The data are

more spread out.

Page 608

Guided Practice

#’s 3-9

Pages 606-608 with someone at home and

study examples!

Read:

Homework: Pages 609-611

#’s 10, 12, 14, 16-24

#’s 30-47

Lesson Check 12-1

Page

752

Lesson 12-1