Kevin Zhou — Problem Solving II Problem 2 · Kevin Zhou #P2.2
Physics · mechanics · electromagnetism
Problem
Problem 3. The purpose of subtracting ⟨X⟩2 in the variance is to make sure it doesn’t change
when a constant is added to x, since shifting something left or right on the number line shouldn’t
change its spread. Verify that for any constant c, varX = var(X +c).