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There are about 7.13 billion humans alive today.

When installing Java, it says that 3 billion devices run Java. The question is, out of how many? How many computing devices that have enough hardware to run Java will be on at some point on a non-holiday Tuesday?

Servers count, smartphones count, and if you see a clear way to refine the definition in the question please feel free to propose an edit or state the slightly different definition in your answer.

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  • $\begingroup$ I heard somewhere that General Motors is now the number 1 seller of computers. I wonder how many computers are in each car... $\endgroup$
    – Gerald Edgar
    Mar 1, 2016 at 2:01
  • $\begingroup$ And this is about history because? $\endgroup$
    – Conifold
    Mar 1, 2016 at 3:57
  • $\begingroup$ It establishes a particular point in the spread of computing technology, which implements a lot of science and math. Also, I anticipate that it'll be hard to come up with an answer for today but any answer is likely to be somewhat historical, or maybe even a set of historical points. History of computing & computer science seem on topic here, and more so here than anywhere else (as far as I can tell). $\endgroup$
    – WBT
    Mar 1, 2016 at 15:22
  • $\begingroup$ Do smartcards (e.g. SIM cards) count? $\endgroup$
    – Martin Schröder
    Mar 2, 2016 at 7:34
  • $\begingroup$ @MartinSchröder I would tend to think not, but could be convinced otherwise by a good answer/definition that does count them. $\endgroup$
    – WBT
    Mar 2, 2016 at 14:03

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