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i sixsigma
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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: Find the probability of three of more surface flaws.
| Number of flaws | Frequency | Probability |
| 0 | 4 | 0.2 |
| 1 | 3 | 0.15 |
| 2 | 5 | 0.25 |
| 3 | 2 | 0.1 |
| 4 | 4 | 0.2 |
| 5 | 1 | 0.05 |
| 6 | 1 | 0.05 |