Will I die while cycling to work?

Statistics about road deaths can be expressed either as number of deaths per time spent or distance travelled and can give you completely different answers, depending on the calculation method.

For example, 'killed or seriously injured' (KSI) number often quoted includes anyone who is taken to hospital following a road collision, regardless of what injury, if any, they suffered. So that will tend to exaggerate the risks.

Yes, there are a lot of different ways of measuring road danger (even more than you mention). See Bob Davis' latest post on the topic (and read his book, 'Death on the Streets', it's the book on this stuff).