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1. The grades of a statistics class are normally distributed with a mean of 72 and a standard deviation of 11. a. What is the

1. The grades of a statistics class are normally distributed with a mean of 72 and a standard deviation of 11. a. What is the probability that a randomly selected student will have a mark more than 68? [3 marks] b. What is the probability that an average mark of a sample of 15 students is less than 68? [3 marks] c. What is the minimum score to be in the top 10% of all scores? [3 marks]

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