Averages from a Grouped Frequency Table
Learn how to find the modal class, median class, and estimate the mean from a grouped frequency table. Let’s get started! 🚀
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🛎️ What Is a Grouped Frequency Table?
- A grouped frequency table organises data into class intervals.
- Each class shows how many values fall within that interval.
🛎️ How to Find the Modal Class?
- The modal class is the class with the highest frequency.
- It shows where the data occurs most often.
🛎️ How to Find the Median Class?
- Add the frequencies to find the total number of values (n).
- Use (n + 1) ÷ 2 to find the median position.
- If n = 25, (25 + 1) ÷ 2 = 13, so the class containing the 13th value is the median class.
🛎️ How to Estimate the Mean?
- Find the midpoint of each class by adding the lower and upper values and dividing by 2.
- Multiply each midpoint by its frequency and add the results.
- Divide this sum by the total frequency to estimate the mean.
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Averages from grouped frequency table
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