Arthur Dent's biology class had a standard deviation of 2.4 on a test, while Ford Prefect's class had a standard deviation of 1.2 on the same test. What can be said about these two classes?
Arthur Dent's class probably has more students than Ford Prefect's.
Ford Prefect's class did better on the test than Arthur Dent's.
Ford Prefect's class did worse on the test than Arthur Dent's.
Arthur Dent's class performed twice as well on the test as Ford Prefect's.
None of the others are correct.