Total cost. The price paid for a security plus the broker's commission and any accrued interest that is owed to the seller (in the case of a bond).
If you want to become a medical examiner, you must earn a medical degree (M.D.). Once you have earned your medical degree, you can seek out knowledge in a pathology residency. Following your residency, you'll sub-specialize in a forensic pathology fellowship.
In most jurisdictions, a medical examiner is required to have a medical degree, although in many this need not be in pathology. Other jurisdictions have stricter requirements, including additional education in pathology, law, and forensic pathology. Medical examiners are typically appointed officers.