Are E2 and E3 mutually exclusive events?

Question

BlackTom AI · Accepted Answer

Question restatement: The prompt asks whether E2 and E3 are mutually exclusive events.

Option 1: No
- This would mean E2 and E3 could occur together in a single trial. In standard probability, events are sets of outcomes from a single trial. If E2 and E3 are distinct elementary outcomes (like outcomes labeled 2 and 3), then they cannot happen simultaneously in the same trial, so their intersection E2 ∩ E3 is empty. Therefore, describing them as not mutually exclusive would be incorrect because P(E2 ∩ E3) = 0 in this typical interpretation.
- A common misconception here is thinking events could overlap if they are related to the same experiment or if they are not exhaustive, but mutual exclusivity depends on the intersection being empty, not on the events' relationships to the experiment in general.

Option 2: Yes
- This statement aligns with the standard definition of mutually exclusive events: two events are mutually exclusive if they cannot occur at the same time, i.e., their intersection is the empty set. If E2 and E3 are distinct outcomes or disjoint events, they do not share any common outcome, so E2 ∩ E3 = ∅ and they are mutually exclusive.
- A practical way to see this is to imagine a single roll of a fair die: outcomes {2} and {3} are disjoint events; you cannot roll both a 2 and a 3 on one roll, hence they are mutually exclusive.

Option 1 versus Option 2 comparison:
- The idea behind No attempts to permit overlap; but in a single trial you cannot realize both E2 and E3 simultaneously if they correspond to distinct final outcomes, so this stance is incorrect.
- The Yes answer correctly captures the mutual exclusivity condition, provided E2 and E3 refer to distinct outcomes or disjoint events in the same experiment.

Additional notes:
- If the context defined E2 and E3 in a way that they could occur together (for example, as events that are not disjoint due to overlapping definitions), the answer could differ. However, in most standard textbook cases where E2 and E3 are distinct outcomes, they are mutually exclusive.
- Remember that mutual exclusivity is about the intersection; whenever E2 ∩ E3 = ∅, the events are mutually exclusive, regardless of the broader structure of the sample space.

COMM_V 190 101-104 2025W1 Final Exam - Practice Questions - Second Half

Are E2 and E3 mutually exclusive events?

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