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To find the range of a data set, we subtract the smallest value from the largest value. 

The given data set is:  
20, 7, 4, 6, 21, 10, 4, 12.

1. Identify the smallest value: 4  
2. Identify the largest value: 21  

Now, calculate the range:  
\[ \text{Range} = 21 - 4 = 17 \]

The correct answer is **17**.

Would you like any further details or explanations?

Here are five related questions for practice:
1. What is the median of this data set?
2. How would you calculate the mean of the given data?
3. If an additional value of 15 is added to the data set, what would the new range be?
4. What are the lower and upper quartiles of this data set?
5. How does the range change if the maximum value is decreased by 3?

**Tip:** The range provides a measure of data variability, but it can be sensitive to outliers. Always consider using other measures like the interquartile range for a more robust analysis.

In a recent survey, 8 people were asked how far they drive to work. Here are the responses: 20, 7, 4, 6, 21, 10, 4, 12. Find the range of this data set.

Learn how to calculate the range of a data set with the given values: 20, 7, 4, 6, 21, 10, 4, 12. The solution involves identifying the maximum and minimum values, then subtracting to find the range. This problem is ideal for students in Grades 6-8.

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