(c) A manufadure of front lights for automobiles runs a test on lamps under a high humidity and high temperature environment using intensity and useful life as the responses of interest. According to...

Extracted text: (c) A manufadure of front lights for automobiles runs a test on lamps under a high humidity and high temperature environment using intensity and useful life as the responses of interest. According to his result, 30% of them yield unsatisfactory results under any criteria. A sample of 12 lamps are chosen and tested. Calculate the probability that: i. 2 lamps will yield unsatisfactory result. i. at least three lamps will yield unsatisfactory result.