In a high school, a teacher gave two sections of a class the same arithmetic test. The results were as follows: Section I: Mean 45, Standard deviation 6.5 Section II: Mean 45, Standard deviation 3.1 Which of the following conclusions is correct?

Group of answer choices

Section I is more heterogeneous than Section II.

Section II is more heterogeneous than Section I.

Both sections are equally variable.

Section II has brighter students than Section I.