20 million
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A brain surgeon works 2 hours per day unless they have to do surgery
If there is a four percent chance that something will occur that means that it will happen four times out of 100. To clarify a bit: Say there is a 4 per cent chance of a given complication following a specific kind of surgery. This means that on average (counting many hundreds or thousands of surgeries) the complication appears in 4 surgeries out of every hundred surgeries.
It depends on how many hours you work per year.
about 100 million per year or more
A couple million appliances are sold Per year