At a Particular Academically Challenging High School,the Average GPA of a High

question 33

Multiple Choice

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.

• A)[2.5261,2.8939]
• B)[2.5667,2.8533]
• C)[2.6180,2.8020]
• D)[2.6384,2.7816]

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