Statistically, is a Jewish person in the business world more likely to
be successful than a non-Jewish person? And what percentage of public
and private corporations over $100million turnover are primarily (more
than 50%) owned by Jewish persons.

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Dear Eireju, 

Answering a question like this is impossible without investing much
time and work. You're basically asking for someone to go through all "public
and private corporations over $100 million turnover" to check which
are "primarily (more than 50%) owned by Jewish persons." There are
probably many corporations that would fit this definition.

You also have to define how we should recognise a Jew. Following the
Nuremberg Laws?

In other words, you might want to have a look at the Google Answers pricing guide:
http://answers.google.com/answers/pricing.html

The second half of the question could in theory be researched, as
noted by politicalguru. Regarding the first half of the question, the
answer is no: line up two businesspeople and try to predict
statistically which will succeed more than the other. If I were an
investor, I think I'd look at many, many, many factors in deciding
whom to back before I looked at their respective religious
affiliations.