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Answer: Probability that a randomly selected unit will contain at least two surface- finish defect is 0.04.
Step-by-step explanation:
Since we have given that
Mean rate defects per unit = 0.3
Since we will use "Poisson distribution":
But we need to find the probability that a randomly selected unit will contain at least two surface-finish defect.
So,
so, it becomes,
Hence, probability that a randomly selected unit will contain at least two surface- finish defect is 0.04.