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20-05-2016
Mathematics

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In a random sample of 1,000 exams, the average score was 500 points with a standard deviation of 80 points.

Find the interval about the sample mean such that the probability is 0.90 that the mean number lies within the interval.

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nobillionaireNobley nobillionaireNobley

28-05-2016

90% c.I. is given by

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