Section 2 3 Interpreting Circle Graphs Things to

Section 2. 3 Interpreting Circle Graphs

Things to Know • Data – pieces of information collected • Data is collected by: − − − − An experiment A survey Polls Interviews Observations Talley Sheets Questionnaires

Things to Know • Circle graphs – are used to display data that is part of a whole, or any percentage data. • The percentages in a circle graph always add up to 100% • All graphs include: – A title (explains what the graph represents) – Data categories have labels – A scale (appropriate for the data) – A key (explains how to read the graph)

Circle Graph • What percentage & fraction is 1 st quarter? • What percentage & fraction is 2 nd quarter? • What percentage & fraction is 3 rd quarter? • What percentage & fraction is 4 th quarter?

TRANSPORTATION The circle graph shows which method of transportation students use to get to Martin Luther King, Jr. , Middle School. Which method of transportation do most students use?

ICE CREAM The circle graph shows which flavor of ice cream students consider their favorite. Which flavor of ice cream is considered the favorite by most students?

TRANSPORTATION The circle graph shows which method of transportation students use to get to Martin Luther King, Jr. , Middle School. How does the number of students who ride a moped to school compare to the number of students who take the bus?

ICE CREAM The circle graph shows which flavor of ice cream students consider their favorite. How does the number of students who prefer peanut butter ice cream compare to the number of students who prefer cookie dough ice cream?

LAND USE The graph at the right shows the different ways land is used in the United States. Which two land uses occupy the least amount of land?

SPORTS The graph below shows students’ choices for favorite sport. Which two sports are the least favorite? Students’ Favorite Sport

Part of a whole Step 1: Find out how many • 88 students were asked items make up their favorite color whole Step 2: Look for parts of the graph you already know- like 1/2 • Find out what half of 88 is ½ x 88

Part of a Whole • The next easiest part of a circle graph to find is half of a half, or ¼ • Find out what ¼ of the whole is ¼ x 88 • Then 1/8 is half of 1/4 1/8 x 88

Find the percent of a number • To find the percent of a number change the percent to a decimal • 33% =. 33 • Then multiply that decimal by the total number 33% of 66. 33 x 66

You try it!!! 1. Find 23 % of 56 2. Find 13 % of 89 3. Find 42% of 68

Example • The first 100 visitors to a state park were asked about their favorite park activity. The results are shown in this circle graph. What is the closest number of these 100 visitors who said hiking was their favorite activity?

Example • A population of 200 students were surveyed on which career path they would like to pursue after graduation and the results are shown in the circle graph. How many more students would like to pursue a career in entertainment that in education?

Assignment • 6. 14 Worksheet Problems #5 -14