1. Mari can package 14 seashells in a box. If she has 360 seashells, how
Reporting Frequency
LESSON 11-1
Problem of the Day
Mari can package 14 seashells in a box. If she has 360 seashells, how
many full boxes does she have? How many shells are left over after the boxes are filled?
25; 10
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2. These are all ways to show often something occurs.
Reporting Frequency
LESSON 11-1
What we’ll study today
Frequency table
Line plot
Histogram
These are all ways to show often something occurs.
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3. A frequency table lists each item in a data set.
Reporting Frequency
LESSON 11-1
A frequency table lists each item in a data set.
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4. Which method of describing data is easily seen in a frequency table?
Reporting Frequency
LESSON 11-1
Additional Examples – Frequency table
The numbers below represent the ages of the students in a karate class. Make a frequency table of the data.
11   5   9   13   8   9   9   11   10   8   6   7   12   11 
13   12   7   6   11   12   10   8
Age
Tally
Frequency
Which method of describing data is easily seen in a frequency table?
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5. A line plot shows the shape of the data
Reporting Frequency
LESSON 11-1
A line plot shows the shape of the data
Data is on a number line (stacks of Xs show frequency)
Best for a small number of data values
Xs must be spaced evenly
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6. Make a line plot of the data in Example 1.
Reporting Frequency
LESSON 11-1
Additional Examples – Line plot
Make a line plot of the data in Example 1.
11   5   9   13   8   9   9   11   10   8   6   7   12   11 
13   12   7   6   11   12   10   8
Write an x for each student above the
age of that student.
Draw a number line from the least to the
greatest data item.
Best for a small number of data values (Why?)
Xs must be spaced evenly (Why?)
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7. A histogram also shows the shape of data.
Reporting Frequency
LESSON 11-1
A histogram also shows the shape of data.
bar graph (no spaces between the bars)
equally sized intervals with no overlap
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8. Hours Spent on the Internet
Reporting Frequency
LESSON 11-1
Additional Examples - Histogram
Make a histogram of the data below.
Hours Spent on the Internet
Hours Tally Hours Tally
Add a title.
Label
each
axis.
Label
each
axis.
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9. Decide the intervals (evenly spaced, no overlap) Labeled axes
Reporting Frequency
LESSON 11-1
(For help, go to Lesson 1-6.)
For histograms:
Title
Decide the intervals (evenly spaced, no overlap)
Labeled axes
X-axis – intervals
Y-axis – frequency (always)
Make bars of equal width
Use a ruler!
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10. Reporting Frequency
LESSON 11-1
Lesson Quiz
1. Make a frequency table and a line plot for the number of students in each class:
Students
Class 23 24 25 2 4 3
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11. How else can you display this data?
Reporting Frequency
LESSON 11-1
Lesson Quiz
2. The data table below shows how many hours of TV different people watch each week. Make a histogram of the data.
Hours
Frequency
0–5
6–10
11–15
16–20
21–25 3 5 10 24 15
What is this called?
How else can you display this data?
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12. What is a frequency table?
Reporting Frequency
LESSON 11-1
Closure
What is a frequency table?
What do histograms and line plots have in common?
What do frequency tables, histograms, and line plots have in common?
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13. Homework for Monday: Lesson 11-1 p. 534 - 536: # 5, 7, 9, 12-16 all
Reporting Frequency
LESSON 11-1
Homework
Homework for Monday:
Lesson 11-1 p : # 5, 7, 9, all
Test on Chapter 3
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