Silicon wafers are used in the manufacture of integrated circuits. Of the wafers manufactured by a certain process, 10% have resistances below specification and 5% have resistances above specification.
a. What is the probability that the resistance of a randomly chosen wafer does not meet the specification?
b. If a randomly chosen wafer has a resistance that does not meet the specification, what is the probability that it is too low?
Let A denote the event that the resistance is above specification, and let ? denote the event that the resistance is below specification. Then A and ? are mutually exclusive.
(a) P(doesn’t meet specification) = 
= 0.05 + 0.10 = 0.15
(b) 
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