457.Crashes on the Half Hour
★★★classical probabilityCh. 2 — Axiomatic and Conditional Probability444+ Problems in Probability
At a busy intersection, the probability of at least one car crash during a 1-hour interval is . Crashes occur independently at a constant rate over time. Find the probability of at least one crash during a 30-minute interval.
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Work with the probability of no crash — that's what multiplies across disjoint intervals.
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