Please help need to get this right! This answer is partially correct but something is missing...

A study of North York College students showed the mean age of all students in the first year of college to be 19.7 years old with a standard deviation of 1.31 years. A randomly selected sample of these first year students also averaged 19.5 years in age with a standard deviation 1.3 years.

c) Select all correct symbol/value pair below (more than one may correct): vu = 19.7 and o = 1.3 Of = 19.7 and s = 1.31 Of = 19.5 and o = 1.31 Ou = 19.5 and o = 1.31 VI = 19.5 and s = 1.31 Ou = 19.5 and s = 1.3 Ou = 19.7 and s = 1.3 Of = 19.7 and o = 1.31