每20分钟看到超跑的概率是0.3，1小时内至少看到一次的概率是多少？

If there is a 30% chance of seeing a supercar in any 20-minute interval, what is the probability of seeing at least one in an hour?

题目类型: 技术面试题

这是一道技术面试题，常见于澳洲IT公司面试中。

难度: medium

标签: Statistics, Probability

参考答案摘要

Assuming independence across intervals: P(no supercar in 20 min)=1−0.3=0.7. In 60 minutes (3 intervals): P(none)=0.7^3=0.343. P(at least one)=1−0.343=0.657.

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