Question: The time needed to complete a final examination in a particular college course is normally distributed with a mean of 90 minutes and a standard

The time needed to complete a final examination in a particular college course is normally distributed with a mean of 90 minutes and a standard deviation of 15 minutes.

a) Write the chance function of the above random variable.

b) What is the probability of completing the exam in one hour or more?

c) What is the probability that a student will complete the exam in more than 70 minutes but less than 85 minutes?

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