26.

A sample of 60 final exam scores out of 200 of a statistics class are considered for study. The average score for these 60 students is 150. Based on previous studies, standard deviation of these scores is 15.50. Construct a 99% confidence interval for true averages of final scores.

A) (20.81, 25.19)

B) (31.22, 31.56)

C) (21.16, 28.84)

D) (144.84, 155.16)