Question: pls help me show solution Suppose X is a normal population with the mean u and standard deviation o=25. A sample of size 45 students

pls help me show solution

Suppose X is a normal population with the mean u and standard deviation o=25. A sample of size 45 students and the sample mean in a statistics test was found to be 75. Use 99% confidence interval. Compute for the upper limit of the confidence interval. *

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