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A. 0.85
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B. 0.72
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C. 0.955
D. 0.83
FUO.Sh
sh the exam.
Disks of polycarbonate plastic from a supplier are analyzed for
scratch and shock resistance. The results from 200 disks are
summarized as follows:
scratch
resistance
high
low
shock resistance
high
low
144
22
25
9
If a disk is selected at random, what is the probability that its
scratch resistance is high or its shock resistance is high?
