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) It is known that on an average four defective items are produced in an hour by certainmachine. Find the probability of at-least, exactly and

) It is known that on an average four defective items are produced in an hour by certainmachine. Find the probability of at-least, exactly and at most 3 defective items in an hour. (Valuesshould be accurate up to 4 decimal places for intermediate calculations)

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