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[Solved] (15 marks) "Disks R’Us" purchases a consignment of 50,000 grade A computer disks and 25,000 grade B disks. The probability that a grade A disk

Question: (15 marks) "Disks R’Us" purchases a consignment of 50,000 grade A computer disks and 25,000 grade B disks. The probability that a grade A disk contains at least one bad sector is 0.0001, whereas, for a grade B disk this probability is 0.0005. Determine the approximate probability that the consignment contains between 15 and 20 (inclusive) disks having bad sectors.

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