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5) A large group of students took a test in Physics and the final grades have a mean of 70 and a standard deviation of
5) A large group of students took a test in Physics and the final grades have a mean of 70 and a standard deviation of 10. If we can approximate the distribution of these grades by a normal distribution, what percent of the students
i) scored higher than 80?
ii) should pass the test?
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