I'm having alot of trouble with these homework problems and how to solve them.
Bob sets two alarm clocks (battery−powered) to be sure he arises for his Monday 8:00 A.M. accounting exam. There is a 73 percent chance that either clock will wake Bob. What is the probability that Bob will oversleep? If Bob had three clocks, would he have a 99 percent chance of waking up?
Half of a set of the parts are manufactured by machine A and half by machine B. Two percent of all the parts are defective. Four percent of the parts manufactured on machine A are defective. Find the probability that a part was manufactured on machine A, given that the part is defective.
I really appreciate if anyone could help me with these