Which of the following triples of numbers have the same standard deviation as the numbers m, n and o?
I. m-2, n-2, o-2
II. 0, m-n, o-n
III. m-4, n+5, o-1	Choose the correct option.
A) I only  B) II only  C) I and III only  D) II and I only  E) I, II, and III
If we add or subtract a constant to each term in a set the standard deviation will not change.   Set {m-2, n-2, o-2} is obtained by subtracting 2 from each term of {m, n, o}.   Set {0, m-n, o-n} is obtained by subtracting s from each term of {m, n, o}.   Set {m-4, n+5, o-1} is totally different from {m, n, o}.   Thus the answer is I and II only.   Answer: II and I only.
<result>D</result>
Which of the following triples of numbers have the same standard deviation as the numbers m, n and o?
I. m-2, n-2, o-2
II. 0, m-n, o-n
III. m-4, n+5, o-1