# statistics

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The average number of radioactive particles passing through a counter during 1 millisecond in a lab experiment is 4. What is the probability that more than 2 milliseconds pass between particles?

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I've been working this out and can't get the answer shown in the book...I use mu = 1/4 thus lambda = 4 P(X > 2) = 1-(1-F(x)) = e^-4x = e^-8 This is not the answe given however so I am lost on this one.

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