Show your work and choose the best answer. The principal randomly selected six students to take an aptitude test. Their scores were:

72.3 81.1 78.4 80.9 81.5 75.5

Determine a 90 percent confidence interval for the mean score for all students.

A) (75.13, 81.43)

B) (75.23, 81.33)

C) (81.33, 75.23)

D) (81.43, 75.13)