SOLUTION: A certain kind of sheet metal has, on average, 3 defects per 14 square feet. Assuming a Poisson distribution, find the probability that a 20 square foot metal sheet has at least 4

Question 1185897: A certain kind of sheet metal has, on average, 3 defects per 14 square feet.
Assuming a Poisson distribution, find the probability that a 20 square foot metal sheet has at least 4 defects. Round your answer to three decimal places.
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
The pmf for the Poisson distribution is .
is computed as .

The probability is .

Now use your scientific calculator to compute the required probability to the desired number of decimal places.
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