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Statement of a problem № m390

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Disks of polycarbonate plastic from a supplier are analyzed for scratch and shock resistance. The results from 100 disks are summarized as follows: Shock resistance High Low Scratch high 70 9 Resistance low 16 5 Let A denote the event that a disk has high shock resistance, and let B denote the event that a disk has high scratch resistance. Are events A and B independent?

Solution:
Disks of polycarbonate plastic from a supplier are analyzed for scratch and shoc

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