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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 40 on a standardized test Assuming a bell shaped distribution where would approximately 95 of the students score OA below 350 or above 510 B below 310 or above 550 C between 310 and 550 D between 350 and 510
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