Question 1170300: During a laboratory experiment, the mean number of radioactive particles passing through a counter in 1 millisecond is 4. What is the probability that atleast 3 practices enter the counter in a given millisecond?
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! This is a Poisson distribution with mean 4
look at probability of 0,1,2 particles enter, and the complement is the answer.
p(0)=e^(-4)=0..0183
p(1)=e^(-4)*4^1/1!=0.0733
p(2)=e^(-4)*4^2/2!=0.1465
that sum is 0.2381
at least 3 is 1-0.2381=0.7619, the answer.
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calculator 1-poissoncdf(4,2)ENTER
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