In the list of numbers: 86, 98, 98, 98, 115, 120, 45, 210, 320, what is the MODE?

The mode of a set of numbers is defined as the value that appears most frequently within that set. In the provided list of numbers, 86, 98, 98, 98, 115, 120, 45, 210, and 320, the number 98 occurs three times, which is more than any other number in that list.

Every other number appears only once or twice: 86 appears once, 115 appears once, 120 appears once, 45 appears once, 210 appears once, and 320 appears once. Therefore, since 98 is the only number that appears with the highest frequency, it is identified as the mode of the data set. In conclusion, the mode is accurately identified as 98.