What is the death rate of coronary artery bypass surgery?

Less than 1%: It should be less than (typically, much less than, these days) 1% overall for any institution. If it is more, perhaps they should not be performing the procedure.

Depends: Go to sts.Org and do the risk calculator analysis according to comorbidities and demographics, obviously patients with renal failure, left main, 80's , diabetes, salvage operation for acute coronary syndrome with cardiogenic shock, morbid obesity, pre operative cardiogenic shock, redo operations, concomitant valve or aortic surgery, severe pulmonary hypertension, COPD will have high mortality/morbidity.

About 1%.: For a straight forward CABG operation, the mortality rate is less than 1% but as dr. Matos-cruz pointed out, there are many other risk factors that can impact the outcome and raise the mortality rate.