Chapter 10 Question 7

The solution is obviously wrong because the check at the end fails (there should be no variability in this ratio).
The reason is that "scale" in R standardizes columns, not rows (which is counter-intuitive, but they do tell us to make sure that the sd of each observation, not variable is 1).
This can be solved by running `dsc = t(scale(t(USArrests)))` instead of `dsc = scale(USArrests)`