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> In 2013, Gmail was available 99.978% of the time, which averages to less than two hours of disruption for a user for the entire year.

Does anyone understand why they use the term "averages" in this statement? What is being averaged? Isn't it just 0.022% * minutes in a year.

I think this means not all outages tracked affected all users equally. Some users would have seen more or less downtime than the 2 hours mentioned.

You are probably right. In which case they should also mention that 99.978% is also an average.