问题
单项选择题
If event A and event B cannot occur simultaneously, then events A and B are said to be:（）
A. collectively exhaustive.
B. statistically independent.
C. mutually exclusive.
答案
参考答案：C
解析：
If two events cannot occur together, the events are mutually exclusive. A good example is a coin flip: heads and tails cannot occur on the same flip.