engineering statistics and probability

Project Description:

a sewing machine has an elapsed maintenance time in hours, t. to restore the machine the sum of the times to perform are t1 (remove), t2(replace needle notch), t3 (verify system operation)
repair time analysis indicated that t1~n(2.0,0.25),t2~n(0.2,0.5), and t3~n(0.25,0.1)
a. what is the probability that t will exceed 4 hours?
b. what is the probability that t will exceed 4 hours given that t has exceeded 2.0 hour?
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