How many college students expelled for cheating?

There's no central, publicly available database tracking the number of college students expelled for cheating across all institutions in the world or even within a specific country. The number varies significantly year to year and from institution to institution, depending on factors like:

* School size and policies: Larger schools will naturally have more instances of cheating, but their policies on punishment may also vary widely. Some schools may have stricter penalties than others.

* Types of cheating: The definition of cheating itself is broad, encompassing plagiarism, collusion, unauthorized assistance, and more. Some instances may result in failing grades, others in suspension, and still others in expulsion.

* Reporting and data collection: Not all schools consistently track and report this data publicly.

Therefore, it's impossible to give a precise answer to your question. You might be able to find some data from individual universities' annual reports or through research focusing on specific institutions or academic dishonesty trends, but a global figure is unlikely to exist.