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 460 with a standard deviation of 40 on a standardized test. Assuming a bell-shaped distribution. A) where Word approximately 68% of the scores fall between? B) approximately 99.7% of the scores fall between what scores. C) What percent of scores Fall between 380 and 540 ?