A survey found that 70% of respondents prefer coffee, 20% prefer tea, and 10% prefer neither. The probability of a randomly selected respondent preferring coffee or tea is ____.
Answer & Analysis
Analysis
Question Analysis
This question involves adding probabilities of mutually exclusive events.
The main focus is to recognize that "coffee or tea" are disjoint categories.
Key Concept Explanation
For mutually exclusive events and :
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