1. Objective: I will be able to define and identify mean, median, mode, and range.

2. Do Now:
1. About how many acres of land were burned by wildfires in 1992?
2. The number of acres burned in 2007 is about the same as the number burned in which other year plotted on the graph?
3. Wildfires burned about _________________ more acres in 2002 than they did in 1997.

3. What is statistics?
Statistics is a field of mathematics that involves collecting and analyzing data. Data is information. 
There are 4 steps involved in doing statistics:
1. Develop a question
2. Collect Data
3. Analyze Data
Decide how to display your data
How can we describe the data?
4. Interpret Data
What do the numbers tell us about our class?
If we collected data from another class, how would those data look?
What does the graph not tell us?

4. Step 1: Develop a question
I want to find out more about the number of people living in the houses/apartments of this class. Which question do you think would help me the most?
A. Who does ___________________ live with? 
B. Do you like who you live with?
C. How many people live in your house or apartment?
D. Where have you lived?

5. Step 2: Collect Data
Think about the place where you live. How many people live in the house/apartment?

6. Number of people living in the house/apartment:
Frequency: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Step 3: Analyzing Data Part A: Displaying our data We can use graphs, tables, and charts to display our data

7. Line Plot

8. Histogram
A histogram is a type of bar graph that shows how the data is spread out.
Example:
This histogram shows the ages to people who visited a store one day at the mall:

10. Describing the Shape of Data in a Bar Graph or Histogram:
This group of data is symmetrical.

11. Describing the Shape of Data in a Bar Graph or Histogram:
These data sets are not symmetrical.
This data set is skewed left. It looks like it has a “tail” on the left.
This data set is skewed right. It looks like it has a “tail” on the right.

12. Stem-and-Leaf Plot
A stem-and-leaf plot is a type of graph that shows numerical data.
Example: This stem-and-leaf plot shows the number of students in each class in a school.

13. Step 3: Analyzing Data Part B: Describing our data
Example Data Set:
Number of people living in the house/apartment
2, 5, 2, 6, 7, 2, 4, 4, 6
The mode for this data is _______.
The median for this data is _______.
The mean for this data is _______.
The range is _______.

14. Step 4: Interpreting Data Let’s look at the data we collected from our class to answer these questions.
What do the numbers tell us about our class?
If we collected data from another class, how do you think those data look?
What does the graph not tell us?

15. Match the vocabulary word on the left to its definition on the right
Match the vocabulary word on the left to its definition on the right. (draw connecting lines)
a. Range
b. Mode
c. Median
The number that occurs most frequently in a data set
2. The middle of a data set (in order from least to greatest)
3. The spread of a data set. The difference between the maximum and minimum values.

16. Use the data on the line plot to answer the questions.
1. List all the values in this data set: _________________________
2. What is the range of the data? _________________________
What is the mode? _____________________________
4. What is the median? __________________________