A manufacturer of front lights for automobiles tests lamps under a high humidity, high temperature environment using intensity and useful life as the responses of interest. The following table shows the performance of 130 lamps:
Useful life _________________________Satisfactory…………..Unsatisfactory Intensity satisfactory…………………………….117……………………3
Unsatisfactory ……………………………………8……………………..2
(a) Find the probability that a randomly selected lamp will yield unsatisfactory results under any criteria.
(b) The customers for these lamps demand 95% satisfactory results. Can the lamp manufacturer meet this demand?