National Welding Uses Industrial Robots in Some of Its Assembly-Line

Essay

National Welding uses industrial robots in some of its assembly-line operations. Management has determined that, on average, a robot breaks down after 1,000 hours of use and that the lengths of time between breakdowns are exponentially distributed.
a. What is the probability that a robot selected at random will break down between 300 and 600 hours of use?
Round your answer to two decimal places.
b. What is the probability that a robot will break down after 1,100 hours of use?
Round your answer to two decimal places.