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Approximately 4% of batteries at Radio Shack are defective.You buy 30 batteries. What is the probability that a) 3 are defective? b) at least one

Approximately 4% of batteries at Radio Shack are defective.You buy 30 batteries. What is the probability that

a) 3 are defective?

b) at least one is defective

(round to 4 decimal places if needed, show all data you put in your calculator)

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