Develop a 90% confidence interval for population mean gpa

Reference no: EM13179585

At a particular academically challenging high school, the average GPA of a high school senior is known to be normally distributed with a variance of 0.25. A sample of 20 seniors is taken and their average GPA is found to be 2.71. Develop a 90% confidence interval for the population mean GPA.

Reference no: EM13179585

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