Question: Two key navigation guidance units that will be packaged together

Two key navigation guidance units that will be packaged together for Boeing’s new 1077 have been subjected to repeated testing. Unit Y functioned properly in 96% of the tests. Unit Z functioned properly in 88% of the tests. Curiously, in 90% of the tests in which Unit Y failed, Unit Z also failed.
a. How likely is it that both units fail?
b. Construct a joint probability table for this situation.
c. If Unit Z functions properly, how likely is it that Unit Y will function properly?


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  • CreatedJuly 16, 2015
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