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For probabilities (much) smaller than 10%, sure.

But adding 10%, 20%, and 35%, is already a pretty bad start. The error rate becomes huge. (in the article example, the 10% estimate of chances of being on time is ~3.5 smaller than the actual 35% correct result).

Being wrong by half an order of magnitude, is being quite wrong :)



I'm not disagreeing with you!




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