From there, you can calculate the angle that each piece of the pie should have. Copyright 2020 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. If you have more than 6 categories, certain sections of a pie chart may be too small to effectively read and interpret. A pie chart displays a set of categories’ proportions, or percentages of the total, in a visual way. Pie Chart . Add all the numbers together to get the total. You might find the following: there are 410 art majors, 420 science majors, 900 language majors, and 540 engineering majors. Having obtained a Master of Science in psychology in East Asia, Damon Verial has been applying his knowledge to related topics since 2010. 1. Here are a few typical questions you may be asked about a pie chart: Individual percentages: What percentage of her monthly expenses does Eileen spend on food? A pie chart displays a set of categories’ proportions, or percentages of the total, in a visual way. Compile your data into categories. In the example, with rounding: Multiply each of the decimals by 100 to get the percentages. You can easily do this by moving the decimal point two places to the right. For example, if Eileen’s rent increases to 30% of her monthly income, she’ll have to decrease her spending in at least one other area. From there, you can calculate the angle that each piece of the pie should have. Unlike a bar graph, the pie chart shows numbers that are dependent upon each other. In this case: Divide each of the categories by the total. A Pie Chart is a special chart that uses pie slices to show relative sizes of data. Solve this problem by turning 15% into a decimal and multiplying. You can tell at a glance that Eileen’s largest expense is rent and that her second largest is her car. Please do as follows to create a pie chart and show percentage in the pie slices. Assign each category a number. Select the data you will create a pie chart based on, click Insert > I nsert Pie or Doughnut Chart > Pie. Differences in percentages: What percentage more does she spend on her car than on entertainment? Use a Pie Chart to Find Percentages and Amounts A pie chart, which looks like a divided circle, shows you how a whole object is cut up into parts. Gather your data. Pie charts are most often used to represent percentages. Pie charts are used to compare the relative size of different data categories. Multiply the decimals from Step 3 by 360 to get the number of degrees each slice of pie should take up in the pie chart. For example, the following figure is a pie chart representing Eileen’s monthly expenses. c) How many people, in this group, have blood types A or B? Pie charts are most often used to represent percentages. Round, if necessary. [1] X Research source Pie charts are best used with nominal or ordinal data, in which 6 or fewer categories are represented. Teach children how to interpret pie charts using percentages with this fantastic lesson pack based on the theme of transport and vehicles. Hide Ads About Ads. Remember that there are 360° in a circle so each group in the pie chart will be a proportion of 360°. In our example, you would label the first slice of the pie as "Freshman, 33.3%". First notice that Eileen puts 15% every month into savings. The pie chart below shows the percentages of blood types for a group of 200 people. Eileen spends 20% on her car but only 5% on entertainment, so the difference between these percentages is 15%. To accurately create a pie chart, you must first work out the percentage of the pie chart that each category should occupy. b) How many people, in this group, do not have blood type O? So you need to figure out 15% of $2,000. Use a Pie Chart to Find Percentages and Amounts, How to Convert between Mixed Numbers and Improper Fractions, How to Interpret a Correlation Coefficient r. A pie chart, which looks like a divided circle, shows you how a whole object is cut up into parts. Show Ads. In the example: These percentages will be the labels for each section. To accurately create a pie chart, you must first work out the percentage of the pie chart that each category should occupy. Montclair State University: Statistical Graphs, Charts and Plots, West Texas A & M University: Virtual Math Lab: Percent and Problem Solving. A survey of the number of people in 180 vehicles is taken. You results will be a list of decimals under 0. Pie Chart: a special chart that uses "pie slices" to show relative sizes of data. Find the slice that represents what Eileen spends on food, and notice that she spends 10% of her income there. \text{Art: } 410 ÷ 2270 = 0.18 \\ \text{Science: } 420 ÷ 2270 = 0.18 \\ \text{Language: } 900 ÷ 2270 = 0.40 \\ \text{Engineering: } 540 ÷ 2270 = 0.24 \\. Children will use their reasoning and calculating skills to solve problems involving pie charts and percentages, where each sector of the pie chart is a multiple of 10%. He also runs a financial newsletter at Stock Barometer. a) How many people, in this group, have blood type AB? For the example, this yields the angles 64.8, 64.8, 144 and 86.4 for the categories of art, science, language and engineering, respectively. Repeat steps 6 and 7 until the whole circle is divided up and all the slices are represented. Having written professionally since 2001, he has been featured in financial publications such as SafeHaven and the McMillian Portfolio. Measure out the first slice of the pie with a protractor. How much a percent represents in terms of dollars: If Eileen brings home$2,000 per month, how much does she put away in savings each month? For example, the following figure is a pie chart representing Eileen’s monthly expenses. To get a percentage, multiply the decimal from step 3 by 100. For example, if you have statistics on four categories of university majors, you might wish to turn that data into a pie chart.