What is the mode in this set of numbers: 4, 4, 5, 6, 7?

The mode of a set of numbers is the value that appears most frequently. In the provided set of numbers: 4, 4, 5, 6, 7, the number 4 appears twice, while all the other numbers appear only once. This means that 4 is the most common value in the set. Since the mode is determined by frequency, the correct answer clearly indicates that 4 is the mode. Understanding the concept of mode is essential for interpreting data and recognizing patterns in numbers, making it a valuable skill in mathematics and data analysis.