The Principal of a High School Randomly Selected Six Students

The principal of a high school randomly selected six students to take an aptitude test.Their scores were:
Determine a 90% confidence interval for the mean score for all students.

A) (74.39,82.94)
B) (82.94,82.94)
C) (83.04,74.39)
D) (74.49,82.94)
E) (82.94,83.04)