Explanation and solution

ks of polycarbonate plastic from a supplier are analyzed for scratch and shock resistance. 2 results from 100 disks are summarized as follows: Shock resistance High Low _ High 70 9 cratch reSIstance Low 15 5 a. lfa disk is selected at random, what is the probabilitythat its scratch resistance is high and its shock resistance is high? in. 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 shock resistance. Are these two events mutually exclusive