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
scratch resistance	high	low
high	70	9
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. If a disk is selected at random, determine the following probabilities. Input your answers in the fractional form (do not simplify).

P(A)=86/100

P(B)=79/100

P(A')=7/50

P(A U B)=95/100

P(A' U B)= ???

Answer rating: 100% (QA)

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