Probability that the system will be up and running = 0.98*0.999*0.99*0.94 = 0.911076012
a.
Reliability by doing back up the vision module with an identical module = 0.98*0.999*0.99*(1-(1-0.94)*(1-0.94)) = 0.965740573
b.
Reliability by doing Back up the movement module with an identical module = (1-(1-0.98)*(1-0.98))*0.999*0.99*0.94 = 0.929297532
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