You've taken some data and now want to analyze it. While raw numbers tell you something, frequently it is patterns in your data that tell you the most about an experiment.
Statistics is the study of patterns in numbers.
During your investigations for this course, the two statistical quantities you will most often use are the Mean and the Standard Deviation. The mean or average is what you probably expect. It is simply the sum of all the data, divided by the number of data points. The most common time use of the average in physics is when repeating an experiment many times. Random errors cause the result to be slightly different each time.