Bingo. When we think about the steps intuitively, we tend to gravitate toward the median. &quot;How long does this usually take?&quot; is asking about a median in surprisingly precise terms.<p>Instead we have to understand the distribution, and the mean as well, and add up how long it takes on average, rather than just in the most numerous case.<p>Further, and perhaps more importantly, by understanding each distribution, you have far greater knowledge about what the expected time will be, and where the delays are most probable; and you can begin to start analyzing where those delays might be coming from in the interactions of all the parts of the system. This is straight-up quality talk right out of W. Edwards Deming, and it&#x27;s how you start to improve how you produce in general. Good stuff.