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A professor determined that the grades on the Statistic Final are normally distributed with a mean...

A professor determined that the grades on the Statistic Final are normally distributed with a mean grade of 68 and a standard deviation of 15.

a) If Mohammed had a z score of 1.25, what was his grade?

b) Students in the top 12 % receive an A the student what is the lowest grade a student can get and still get an A?

c) Students in the bottom 15% will fail the course. What is the cutoff grade a student can get and still pass?

Math   Statistics-And-Probability   
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Note-if there is any understanding problem regarding this please feel free to ask via comment box..thank you

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