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 260 and a standard deviation of 30 on a standardized test. Find and interpret the z-score of a student who scored 500 on the standardized test.
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