just kidding. assuming a normal distribution is a big, well, assumption, but since it makes life easier why not. we may be inside the StandDev BUT another way of stating 2/3 of the data points are inside is that we spend 2/3 of our time inside --
and we've been above for a long long time now.
someone clever could actually measure how long we've stayed above before and see how it compares to how long we've stayed above this time.