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a set of final examination grades in an introductory statistics course is normally distributed with a...

a set of final examination grades in an introductory statistics course is normally distributed with a mean of 77 and a standard deviation of 7 complete parts a through d.
a. what is the probability that a student scored below 89 on this exam
b. what is the probability that a student scored between 70 and 93
c. the probability is 15% that a student taking the test scores higher than what grade
d. if the professor grades on a curve is a student better off with a grade of 84 on this exam or a grade of 74 on a different exam where the mean is 66 and the standard deviation is 4

Math   Statistics-And-Probability   
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