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Scores on Professor Combs' Statistics Final Exams have a long term history of being normally distributed,...

Scores on Professor Combs' Statistics Final Exams have a long term history of being normally distributed, with a mean of μμ = 72 and a standard deviation of σσ = 9

a.) Find the probability that a single student will score above a 77 on the Final exam.

b.) Find the probability that a single student will score between a 67 and 77 on the Final exam.

c.) Find the probability that an entire class of 20 students will have a class average above a 77 on the exam.

d) Find the probability that an entire class of 20 students will have a class average between 67 and 77 on the Final exam.

Math   Statistics-And-Probability   
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