Finding the sample mean is pretty straightforward. You simply add up all the data points and then divide by the number of data points. For instance, if your data set is 5, 10, 15, 20, the sum is 50, and with 4 data points, the mean is 50/4 = 12.5. What kind of data are you working with? I'd love to help you calculate it or answer any other questions you have!