5990概率简单数值题short

Expected Time to the Third Arrival

题目

Orders arrive at a matching engine as a Poisson process with rate 4 per minute. What is the expected time, in seconds, until the 3rd order arrives (measured from time 0)?

解题计时

0:00

提交作答时记录，用于后续平均用时统计。

你的答案

数值

seconds

只填写数值本身，单位 seconds 已固定在输入框右侧。