What does mean prev?

The term "mean" typically refers to the average value of a set of numbers, calculated by summing the values and dividing by the count of those values. In statistics, it is often used to represent the central tendency of a dataset. "Prev" is usually shorthand for "previous" and can refer to the prior value or state of something, often used in contexts like data comparisons or trends. Together, "mean prev" could imply the average of previously recorded values in a dataset.