Final answer:
X-bar represents the mean of a sample dataset; it is the sum of the data values divided by the number of values. (Option 1).
Step-by-step explanation:
The term X-bar (x with a line over it) represents the mean of a set of data. It is a symbol used to denote the average value of a sample, and it's expressed as the sum of all data values divided by the number of data points in the sample.
This statistic is particularly useful for analyzing data and finding the center or typical value of a data set. To calculate the sample mean, you can multiply each distinct value by its frequency (if values are repeated) and then divide the sum of these products by the total number of data values in the set.
The mean can be affected by outliers and extreme values, which is why sometimes the median (another measure of the center of the data) is used as a better representation of the dataset's center, especially when there are significant outliers. (Option 1).