MATH 225 Week 2 Frequency Tables and Histogram Notes
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Displaying Data MATH225 Frequency Distributions and Their Graphs A Frequency table is a table that shows classes or intervals of data with a count of the number of entries in each class. The frequency of a class is the number of data entries in the class. Cla ss Frequency, f 1–5 5 6– 8 10 11– 6 15 16– 8 20 21– 5 25 26– 4 30 Constructing a Frequency Distribution from a Data Set Decide on the number of classes to include in the frequency distribution. (This will be given to you in your homework). Find the Class Width. Find the range of the data. (highest – lowest data value) Divide the range by the number of classes. Round UP to the next convenient number. Find the Class Limits. Use the minimum data entry as the lower limit of the first class. Add the class width to the lower limit to find the lower limit of the next class. 274955041875©2024 Chamberlain University ©2024 Chamberlain University 1 Make a tally mark for each data entry in the appropriate class. ©2024 Chamberlain University2 Count the tally marks to find the total frequency “f” for each class. Example: The following data represents the ages of the 50 most powerful women in the world of 2012. Construct a frequency distribution, using seven classes. 26, 31, 35, 37, 45, 47, 48, 48, 49, 51, 52, 54, 54, 54, 56, 57, 57, 57, 58, 59, 59, 62, 62, 63, 66, 66, 67, 67, 72, ClassesF requenc
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