- The rate is 1/800
- The mean is 1/800*(200)
(a) 1 - poissCdf(1/800*200,0,1) = 0.026499
- 0.026499 = Probability that a page is deemed unsatisfactory OR Probability that a page needs to be retyped
(b) How do you attempt this ?
2026-03-30 17:07:36.1774890456
Poisson Distribution Worded Problem (Typist & Corrections Question)
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Your answer to part (a) is indeed correct. Call this probability $p_u$.
Then the answer to part (b) can be determined as follows. More than two attempts are needed if and only if the first two attempts fail. This happens with probability $p_u^2 = \Bigl(1-\frac{5e^{-1/4}}{4}\Bigr)^2 \doteq 0.00070220$.