The space shuttle flight control system called PASS (Primary Avionics Software Set) uses four independent com- puters working in parallel. At each critical step, the comput- ers "vote" to determine the appropriate step. The probability that a computer will ask for a roll to the left when a roll to the right is appropriate is 0.0001. Let X denote the number of computers that vote for a left roll when a right roll is appro- priate. What is the mean and variance of X?