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Use the following information to answer the following four questions. Scores for an exam follow a...

Use the following information to answer the following four questions. Scores for an exam follow a normal distribution with a mean score of 60 points and a standard deviation of 10 points.

A. What is the probability of scoring 75 points or more on the exam? Round your answer to three decimal places.

B. A random sample of 9 people is taken. What is the probability that their mean score is 75 points or more? Round your answer to the nearest whole number.

C. A random sample of 4 people is taken. What is the probability that their mean score is 62 points or more? Round your answer to three decimal places.

D. What is the probability of scoring 62 points or more on the exam? Round your answer to three decimal places.

Math   Statistics-And-Probability   
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