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關於二項式分配與波松分配(((急!!

Oct 6th 2013, 12:22

Q1.
某個路段發生交通事故的次數服從波松分配，平均每月1.5次。現在欲觀察這個路段2個月，最多發生1次事故的機率為何？

Q2.
觀察經過某十字路口的車輛發現，直行、右轉與左轉的車輛比例分別為0.6, 0.3, 與0.
觀察20部經過此路口的車輛，令X為有轉彎的車輛。假設這20部汽車彼此是獨立的。直行車與轉彎車至多相差3輛的機率為何？

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