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3. Time that is needed to fix a car engine problem follows a normal distribution with mean of 48 and std of 5 minutes. A

3. Time that is needed to fix a car engine problem follows a normal distribution with mean of 48 and std of 5 minutes. A mechanics tells a customer that it takes maximum of 1 hour to fix the engine.

a. What is the probability that the mechanic's estimation about the time does not happen?

b. If the mechanic wants to give an estimation about time with 98% confidence, what would be the time?

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