My estimate for the volume of the Great Lakes spanned several orders of magnitude, because I multiplied the uncertainties in all three dimensions.
Which has relevance to real scenarios: an estimate with several independent uncertainties had better give a range, if not strictly the product of all of them, at least wider than an estimate with just one similar uncertainty.
More than an order of magnitude! My answers often crossed six orders of magnitude, and I still only got 5/10!
My estimate for the volume of the Great Lakes spanned several orders of magnitude, because I multiplied the uncertainties in all three dimensions.
Which has relevance to real scenarios: an estimate with several independent uncertainties had better give a range, if not strictly the product of all of them, at least wider than an estimate with just one similar uncertainty.