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If the probability of 1 streetcar which travels 300km/day breaking down is 0.1, then it will break down once every ten days for an MTBF of 3000km (which I think is CLRVish). If the probability is 0.1 in a fleet of 100 cars, there will be 10 breakdowns a day but MTBF remains 3000km. The only way your way makes sense is that *one streetcar will break down a day irrespective of fleet size* but that's kinda bananas unless you have an external factor such as I mentioned above re maintenance.
What you've said is logical and it's been a long time since I took stats in university.
I'll just hide behind my original argument that reliable data on MTBF for the Flexities will be more readily available once the fleet size increases. It's still early in the game for the Flexities thanks to Bombardier's slow delivery. There are many variables that can affect MTBF and in my opinion we need to wait until the fleet is larger and has been in service longer before we can pass judgment. Any new system is going to have problems and no doubt the Flexities have their fair share of bugs even now.
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