Use the Empirical Rule to Describe Data That Are Bell $97.5 \%$

question 75

Multiple Choice

Use the Empirical Rule to Describe Data That Are Bell Shaped
-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 50 on a standardized test. Assuming a bell-shaped distribution, what percentage of scores exceeded 330 ?

• A) approximately \(97.5 \%\)
• B) approximately \(95 \%\)
• C) approximately \(2.5 \%\)
• D) approximately \(84 \%\)

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