In a set of numbers, if 4, 4, 5, 6, and 8 are present, what is the mode of this set?

The mode of a set of numbers is defined as the number that appears most frequently. In the given set of numbers, which includes 4, 4, 5, 6, and 8, the number 4 appears twice, while all the other numbers (5, 6, and 8) appear only once. Since no other number in the set has the same or greater frequency as 4, it is identified as the mode. This recognition of frequency is fundamental in determining the mode, making 4 the correct answer. The mode serves as an important measure of central tendency, indicating which number is the most common in a dataset.