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A large group of students took a test in Statistics and the final marks have a mean of 70 and a standard deviation of 10.

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A large group of students took a test in Statistics and the final marks have a mean of 70 and a standard deviation of 10. By assuming the data is approximately normal, find the probability that the students scored i. less than 40 marks. (3 points) ii. higher than 80 marks. (3 points) iii. between 50 marks and 75 marks. (4 points)

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