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What is the probability of having at least two rainy days within a span of 7 days?
- 1 - (7/10)⁷ - 7C1 * (3/10) * (7/10)⁶
- 1 - (7/10)⁷ - 7C1 * (3/10) * (7/10)⁶
- 1 - (7/10)⁷ - 7C1 * (3/10) * (7/10)⁶
- 1 - (7/10)⁷ - 7C1 * (3/10) * (7/10)⁶
Correct answer: 1 - (7/10)⁷ - 7C1 * (3/10) * (7/10)⁶
Solution
The probability of at least two rainy days is the complement of having zero or one rainy day. This is calculated as 1 minus the probabilities of zero and one rainy day, which are derived using the binomial distribution formula.
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