natsuki8043 natsuki8043

25-11-2022
Mathematics

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explanation from past experience, a professor knows that the test score of a student taking his final examination is a random variable with mean 73.4 and standard deviation of 7.9. how many students would have to take the examination to ensure, with probability at least 0.89, that the class average would be within 2.0 points of the average

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The sum of twice a number and three