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 are independent?

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Chapter8: Sequences, Series,and Probability
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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 are independent?

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