9. A study was conducted of students admitted to the top graduate business schools. The data contained in the CD file named GPA show the undergraduate grade point average for students and is consistent with the findings reported (“Best Graduate Schools,” U.S. News and World Report, 2001). Using past years’ data, the population standard deviation can be assumed known with σ  .28. What is the 95% confidence interval estimate of the mean undergraduate grade point average for students admitted to the top graduate business schools?