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

question 9

Multiple Choice

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

• A)[2.5167,2.9033]
• B)[2.5261,2.3939]
• C)[2.5615,2.8585]
• D)[2.6358,2.7842]

---

Definitions:

Ages

Refers to the various stages of life or periods in history.

Legionnaires' Disease

An infectious disease caused by Legionella bacteria, characterized by severe pneumonia.

Glottis

The part of the larynx consisting of the vocal cords and the slit-like opening between them.

Diaphragm

A dome-shaped, flexible muscle separating the chest cavity from the abdominal cavity in humans, playing a major role in breathing.