Do NOT hand in unnecessary minitab output. Your homework should be a nice little report, with clear cross-referencing between pages with minitab and pages where you have answered questions.
Standard deviation is the most common measure of variability in a set of data.
This is often the case. That is, sd stays the same, even though mean may be changing. One student noted that we would expect more variability in neck and chest measurements because bears change from scrawny at the end of winter to fat in late fall. But head size stays much the same through all this. But head length is stable.