National Welding uses industrial robots in some of its assembly-line operations. Management has determined that, on average, a robot breaks down after 1000 hr of use and that the lengths of time between breakdowns are exponentially distributed. What is the probability that a robot selected at random will break down between 600 and 800 hr of use?
A. 0.264
B. 0.135
C. 0.264e^(-0.0016)
D. 0.135e^(-0.0016)
