Using the probability concept, we have that:
a) It would not be unusual to observe one component​ fail, since the probability that one component​ fails is greater than 0.05.
b) It would be unusual to observe two components​ fail, since the probability that two components​ fail is less than 0.05.
A probability is given by the number of desired outcomes divided by the number of total outcomes. If a probability is less than 0.05, the event is considered unusual.
In this problem, the probabilities are given as follows:
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