SAT Math: Identify the mode
10+ practice questions in Praczo
The concept, explained
- 1
The mode is the value that appears most often in a data set. Count the frequency of each value; the highest frequency wins.
- 2
A data set can have one mode (unimodal), two modes (bimodal), or no mode at all if every value appears the same number of times.
- 3
Unlike mean and median, the mode is not affected by the size of the numbers — it depends only on how often values repeat.
- 4
From a frequency table or dot plot, the mode is the value with the tallest bar or the most dots.
- 5
The mode can be used for categorical data (e.g., the most common color), where mean and median don’t apply.
- ✗ Reporting the frequency instead of the value itself (e.g., saying "5" because 5 data points share that value, when the value is actually "7").
- ✗ Missing that a set can have more than one mode.
- ✗ Calling every set of numbers "unimodal" without checking whether two values tie for highest frequency.
SAT-style practice
What is the mode of the data set {4, 7, 2, 7, 9, 4, 7, 5}?
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