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A sample of 25 students from a Faculty has been obtained to estimate the average grade of the students' records in the Faculty. It is

A sample of 25 students from a Faculty has been obtained to estimate the average grade of the students' records in the Faculty. It is known from other courses that the standard deviation of the scores in said Faculty is 2.01 points. The sample mean was 4.9

In the 90% confidence interval for the mean, what is the value of Z?

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