See there are two crash sensors and smart sensors working in parallel. This means for each of the pair the reliability is 0.97*0.95 = 0.9215
That means the chance of one failing is 1 - 0.9215 = 0.0785
The chances of both failing is 0.0785*0.0785 = 0.0061
The chances of both not failing is 1 – 0.0061 = 0.9938
Hence the parallel section of crash and smart sensor’s reliability is 0.9938
Now the rest of the process is in series. Hence we need to multiply all of them
0.9938*0.99*0.98*0.99*0.97 = 0.9259
That is the reliability of the entire system = 0.9259
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