A Study Was Designed to Investigate the Effects of Two

Multiple Choice

A study was designed to investigate the effects of two variables - (1) a studentʹs level of mathematical anxiety and (2) teaching method - on a studentʹs 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 480 with a standard deviation of 30
On a standardized test. Assuming a mound-shaped and symmetric distribution, in what range
Would approximately 68% of the students score?

A) between 450 and 510
B) above 510
C) below 510
D) below 450 and above 510