Two events are non mutually exclusive events are those that have an overlap. That is, there is at least one outcome that is "favourable" to both events.
For example if, for a roll of a die,
event A: the outcome is even
event B: the outcome is a prime
Then the outcome 2 is favourable to both A and B and so A and B are not mutually exclusive.
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The definition of mutually exclusive events is that the events can't occur at the same time. For example, you can't flip a coin and get a head and a tail; they are mutually exclusive events.
It must be "mutually exclusive" since "non mutually" does not even mean anything!
No, if two events are mutually exclusive, they cannot both occur. If one occurs, it means the second can not occur.
At most one of the events can occur.
Yes, they are. Mutually exclusive events cannot occur together. Complementary events cannot occur together either because an event and its complement are the negative of each other.