Miles Nordin wrote:
>     re> Indeed.  Intuitively, the AFR and population is more easily
>     re> grokked by the masses.
>
> It's nothing to do with masses.  There's an error in your math.  It's
> not right under any circumstance.
>   

There is no error in my math.  I presented a failure rate for a time 
interval,
you presented a probability of failure over a time interval.  The two are
both correct, but say different things.  Mathematically, an AFR > 100%
is quite possible and quite common.  A probability of failure > 100% (1.0)
is not.  In my experience, failure rates described as annualized failure
rates (AFR) are more intuitive than their mathematically equivalent
counterpart: MTBF.
 -- richard

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