The Readylite Company Produces a Flashlight Which Is Perfectly Reliable

Multiple Choice

The Readylite Company produces a flashlight which is perfectly reliable except for two components: the battery,which has a random failure rate of one in every five hours of operation; and the light bulb,which has a random failure rate of three in every ten hours.What is the probability that the flashlight will perform reliably for one hour?

A) 0.50
B) 0.56
C) 0.70
D) 0.80
E) 1.50