The principal randomly selected 6 students to take an aptitude test. Their scores were: 91.5, 80.5, 74.0, 76.7, 76.6, and 77.1 Determine a 90% confidence interval for the mean score for all students.

A) (74.23, 84.57) B) (65.90, 89.57) C) (70.19, 85.28) D) (71.82, 83.65) E) None of the Above