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 (a) If a disk is selected at random, what is the probability that its scratch resistance is high and its shock resistance is high? (b) if a disk is selected at random, what is the probability that its scratch resistance is high or its shock resistance is high? (c) Consider the event that a disk has high scratch resistance and the event that a disk has high sho ock resistance. Are these two events mutually exclusive?

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Chapter1: Combinatorial Analysis
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1. 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
(a) If a disk is selected at random, what is the probability that its scratch resistance is high and its shock resistance is high?
(b) If a disk is selected at random, what is the probability that its scratch resistance is high or its shock resistance is high?
(c) Consider the event that a disk has high scratch resistance and the event that a disk has high sho ock resistance. Are
these two events mutually exclusive?
Transcribed Image Text:1. 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 (a) If a disk is selected at random, what is the probability that its scratch resistance is high and its shock resistance is high? (b) If a disk is selected at random, what is the probability that its scratch resistance is high or its shock resistance is high? (c) Consider the event that a disk has high scratch resistance and the event that a disk has high sho ock resistance. Are these two events mutually exclusive?
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