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Fifty students are enrolled in the Economics class. After the first examination, the random Sample of five papers had the following grades: 60, 75, 80, 70, and 90.

a. Compute the standard error.

b. Find out the 90% confidence interval for mean grade of all the students in class.

c. Find out the margin of error?

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Category:- Statistics and Probability
Reference No.:- M921018

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