Our first observation is that memory errors are not rare
events. About a third of all machines in the fleet experience
at least one memory error per year (see column CE Incid.
%) and the average number of correctable errors per year
is over 22,000. These numbers vary across platforms, with
some platforms (e.g. Platform A and B) seeing nearly 50% of
their machines affected by correctable errors, while in others
only 12–27% are affected. The median number of errors per year for those
machines that experience at least one error ranges from 25 to 611.
From the paper that you cited:
Our first observation is that memory errors are not rare events. About a third of all machines in the fleet experience at least one memory error per year (see column CE Incid. %) and the average number of correctable errors per year is over 22,000. These numbers vary across platforms, with some platforms (e.g. Platform A and B) seeing nearly 50% of their machines affected by correctable errors, while in others only 12–27% are affected. The median number of errors per year for those machines that experience at least one error ranges from 25 to 611.