The space shuttle flight control system called PASS (Primary Avionics Software Set) uses
Chapter 3, Problem 3-22(choose chapter or problem)
The space shuttle flight control system called PASS (Primary Avionics Software Set) uses four independent computers working in parallel. At each critical step, the computers 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 appropriate. What is the probability mass function of X?
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