Maths Probability Tutorial 13- Poisson Distribution

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Twenty sheets of aluminum alloy were examined for surface flaws. The frequency of the number of sheets with a given number of flaws per sheet was as follows:

What is the probability of finding a sheet chosen at random which contains 3 or more surface flaws?

Number of flaws Frequency
0 4
1 3
2 5
3 2
4 4
5 1
6 1

What is the probability of finding a sheet chosen at random which contains 3 or more surface flaws?

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