Homework Answers
Let X denotes the number of trials that are needed to find the first detective item.
The probability that first defective item is the fourth or fifth one checked
= P(X = 4) + P(X = 5)
![= [(1-0.1)^3*0.1] + [(1-0.1)^4*0.1]](http://img.homeworklib.com/questions/b965e8d0-6ff2-11ea-9b8f-cf6ee301aab1.png?x-oss-process=image/resize,w_560)
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