Use the Empirical Rule to Describe Data That Are Bell $97.5 \%$

Multiple Choice

Use the Empirical Rule to Describe Data That Are Bell Shaped
-A study was designed to investigate the effects of two variables - (1) a student's level of mathematical anxiety and (2) teaching method - on a student's achievement in a mathematics course. Students who had a low level of mathematical anxiety were taught using the traditional expository method. These students obtained a mean score of 430 with a standard deviation of 50 on a standardized test. Assuming a bell-shaped distribution, what percentage of scores exceeded 330 ?

A) approximately $97.5 \%$
B) approximately $95 \%$
C) approximately $2.5 \%$
D) approximately $84 \%$