Astudy was designed to investigate the effects of two variables long dash (1) a student's level of mathematical anxiety and (2) teaching method long dash 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 250 with a standard deviation of 40 on a standardized test. assuming a mound-shaped and symmetric distribution, in what range would approximately 99.7% of the students score?