A researcher studied the number of anxiety attacks recounted over a two-week period by 30 people in

Question:

A researcher studied the number of anxiety attacks recounted over a two-week period by 30 people in psychotherapy for an anxiety disorder. In an article describing the results of the study, the researcher reports: "The mean number of anxiety attacks was 6.84 (SD = 3.18)." Explain these results to a person who has never had a course in statistics.