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Probability calculations

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Always get overwhelmed by the amount of material when covered at a comprehensive level. Attached is the study material of what to be prepared to cover at the conclusion of this course. I have worked through them but get stumped at several points. Can you provide a systematic approach to these problems and provide a reference to refer to make sure my solutions are accurate. It would helpful if you can explain why you did what you did, as this is just a helpful of study and questions may appear differently at the actual conclusion of the course.

The length of time to do a complete full service oil choice at Speedy-Lube, is normally distributed with a mean of 15.8 minutes and a standard deviation of 2.2 minutes. Refer to Table 5C on the Handout for MegaStat output.
Part A
Analyze the output above to determine what percentage of complete full service oil change will fall between 10 and 20 minutes?
Part B
What percentage of complete full service oil changes will take more than 20? If 1000 cars had a complete full service oil change how would you expect to be finished in more than 20 minutes?

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The solution gives the calculation of probability based on normal distribution

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