How to Calculate the Mode of a Grouped Frequency
In science experiments, grouped frequency distributions, which sort data according to different intervals and note the frequency at which data appears in each interval, can be a useful way of organizing data. For instance, if you wanted to organize the scores of a fifth grade class based on different grade intervals (90s, 80s, 70s, etc.), you could create a grouped frequency distribution that notes the number of scores in each interval. Assuming you have access to the raw data of the distribution, you may calculate not only the interval that is the mode, but the actual score that is the mode of the distribution.
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Instructions
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1
Determine what classes you want to use to describe your data. For instance, if dividing a class' scores on a math test into the 90s, 80s, and so forth, set up a table in which each class is one row.
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2
Count the number of students falling into each distribution. If two people scored between 90 and 100, for instance, then you have two people in that class.
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3
Determine which class has the most people. This class is the location of the mode and you may consider this interval -- i.e., scores from 80 to 90 -- to be the mode of the distribution.
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4
Determine the individual score within the class in Step 3 that occurs the most frequently. Of all of the scores, this score is the mode.
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