How Do You Construct A Grouped Frequency Distribution Chart Using Classes?
Stuck on how to make a frequency distribution chart and determine class widths? This article will guide you through the process in simple, clear steps. Find the highest value and the lowest value in your data group. Example: For the group “20,2,65,75,75,92,40,42,43,12” the highest number is 92 and the lowest number is 2. Find the range. The range is just the amount between the lowest and highest numbers, so we subtract the low from the high. Example: 92-2=90 Find the width of each class. If the number of classes is given (i.e. 9), divide your range from step 2 by the given number of classes: 90/9=10. Round up if your class width is anything other than a whole number. For example, if your width from step 3 is 2.3, round up to 3. Construct the x-axis of your chart as follows. The class width from step 3 was 10, so we add 10 to 2 (our lowest number in the data set) to get: 12,22,32,42,52,62,72. Subtract .5 from all of those data points (to prevent any of the numbers in your data set from
