SOLUTION: the number of typographical error per page in a manuscript in poisson distributed with a mean of 0.20 per page. determine the probability on a given page, A.) there are exactly 3 t

Question 847529: the number of typographical error per page in a manuscript in poisson distributed with a mean of 0.20 per page. determine the probability on a given page, A.) there are exactly 3 typographical errors B.) there are at most 2 typographical errors
Answer by swincher4391(1107) (Show Source): You can put this solution on YOUR website!
This sounds like a poisson question.
If we have that
Then we can look at P[X=n] =
And so P[X=3] =
P[X<=2] = P[X=0] + P[X = 1] + P[X=2]
I'll factor out
=
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