Disks of polycarbonate plastic from a supplier are analyzed for scratch and shock resistance. The results from 121 disks are summarized as follows: Shock Resistance High Low Scratch High 78 12 Resistance Low 11 20 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. If a disk s selected at random, determine the following probabilities. Round your answers to two decimal places (e.g. 98.76). Ca) P(A) = i b) P(B) = i c) P(A') = i

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