Computer keyboard failures are due to faulty electrical connects (20%) or mechanical defects (80%). Mechanical defects are related to loose keys (27%) or improper assembly (73%). Electrical connect defects are caused by defective wires (37%), improper connections (13%), or poorly welded wires (50%). (a) Find the probability that a failure is due to loose keys. (b) Find the probability that a failure is due to improperly connected or poorly welded wires.

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