Use Chebyshev S Inequality to Describe Any Set of Data $75 \%$

Multiple Choice

Use Chebyshev s Inequality to Describe Any Set of Data
-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 350 with a standard deviation of 20 on a standardized test. Assuming no information concerning the shape of the distribution is known, what percentage of the students scored between 310 and 390

A) at least $75 \%$
B) approximately 95\%
C) at least $88.9 \%$
D) approximately $68 \%$