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a) From a production of screws in which 10% are defective, a sample of 10 screws is selected. Find the probability of finding no more

a) From a production of screws in which 10% are defective, a sample of 10 screws is selected. Find the probability of finding no more than two defective bolts.

b) Suppose that the average number of accidents that occur weekly on a certain highway is equal to 1.2. Approximate the probability that at least one accident will occur during the current week.

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