Average age of students of X college has been 26 years with standard deviation of 2.2 years. If there were 40 students in the English class last semester and the average age for these students was 36 years, what would be the upper limit of the 95% confidence interval for the age of the students attending X College this academic year?

a.36.7

b.26.6

c.35.3

d.25.3