For a large Internet service provider (ISP), web virus attacks occur at a mean rate of 150
Question:
(a) Estimate the probability of at least 175 attacks in a given day.
(b) Estimate the probability of fewer than 125 attacks.
(c) Is the normal approximation justified? Show all calculations.
(d) Use Excel to calculate the actual Poisson probabilities. How close were your approximations?
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Let 150 1225 a P X 175 P X 1745 PZ PZ 200 1 PZ 200 1 9772 0228 b P X 125 ...View the full answer
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Related Book For 
Applied Statistics In Business And Economics
ISBN: 9780073521480
4th Edition
Authors: David Doane, Lori Seward
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