A trading company has eight computers that it uses to trade on the New
York Stock Exchange (NYSE). The probability of a computer failing in a
day is 0.005, and the computers fail independently. Computers are
repaired in the evening and each day is an independent trial.
a. What is the probability that all eight computers fail in a day?
b. What is the mean number of days until a specific computer fails?
c. What is the mean number of days until all eight computers fail in
the same day?
