Warm Up! The number of text messages sent on one day by different students are shown below. Make a

frequency table and histogram that represents the data. Be sure to label the graph and your axes.

Histogram Shape (data distribution)

After collecting class data, draw a rough sketch of each graph. Then, describe the distribution according to

the shape of the histogram:

Shape: ______________________________ Shape: _______________________________ Shape: ____________________________

17 3 1 30 11 7 1 5 2 39 22 13 2 0 21 1 29 40

27 2 0

Histograms and Stem-and-

Leaf Plots

Unit 11 Day 2

Siblings Summer

Trips

Social

Networks

Stem-and-leaf plot:

_______________________________________________________________________________________________________

Example 1: The numbers of students in 14 math classes at Hinsdale Central are given below. Use the data to make a stem-and-leaf plot and describe the shape of the distribution.

Key: _________________________

Example 2: The ages of professional XBOX players are given below. Use the data to make a stem-and-leaf plot and describe the shape of the distribution.

Partner Practice! Included below is the stem-and-leaf plot that illustrates the number of miles driven by each new car parked in a lot. 1. How many cars have over 50 miles?

2. How many cars have less than 50 miles?

3. How many total cars were checked for mileage?

4. What is the most miles on a car? Lowest mileage?

24, 14, 12, 25, 32, 18, 23, 24, 9, 18, 34, 28, 24, 27

Math Class Size

Stem Leaf

12, 23, 21, 18, 22, 32, 38, 28, 15, 36, 20, 21

Ages of Professional XBOX Players

One more example! Heading into the NHL playoffs, teams are ranked by their division using point values (from their # of wins and ties) to determine which teams from each division will make the playoffs. Use the data to make a back-to-back stem-and-leaf plot. Source: www.NHL.com

Western Eastern

Key:

Using the same information described above, make a frequency chart and histogram of the Eastern Division teams

to describe the shape of the distribution. Be sure to label the graph and your axes.

Assuming only the top six teams from each division make the playoffs, what is the cutoff score for the Eastern

Division?

Western Conference: 100, 99, 95, 92, 90, 89, 62, 56, 109, 101, 97, 109, 104, 102 Eastern Conference: 99, 98, 91, 89, 84, 78, 71, 68, 54, 113, 101, 100, 110, 108

Point totals of NHL Teams Leading into Playoffs