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 Resistance High 71 8
Low 18 3


Consider the event that a disk has high scratch resistance and the event that a disk has high shock resistance. Are these two events mutually exclusive? Are these two events dependent or independent? Please show your analysis.