Unit 9  Data Distribution
Learning Outcomes
• Collect, organize, and represent data in circle graphs • Make observations and inferences about data represented in a circle graph • Compare data represented in a circle graph with the same data represented in bar graphs, pictographs, and line plots • Determine the effect on measures of center when a single value of a data set is added, removed, or changed • Define measures of center as mean, median and mode • Use a number line to show mean as a balance point • Define mean as a balance point 
Essential Questions
•How do the data collected influence how we represent and interpret the data? • How does the shape of the data help you draw conclusions about the data? • Why are different measures of center used to describe a set of data? 
Vocabulary
measures of center
mean median mode range 
data
balance point percentage average 
ling graph
circle or pie graph bar graph pictograph line plots 
Measure of Center

Measures of center generally tell us about the middle, or center, of a distribution.

Data

A collection of facts, such as numbers, words, measurements, observations or even just descriptions of things.

Percentage

A percent is a ratio whose second term is 100. Percent means parts per hundred.

Types of graphs