A study was designed to investigate the effects of two variables - (1) a studentʹs level of mathematical anxietyand (2) teaching method - on a studentʹs achievement in a mathematics course. Students who had a low levelof mathematical anxiety were taught using the traditional expository method. These students obtained a meanscore of 480 with a standard deviation of 20 on a standardized test. Assuming no information concerning theshape of the distribution is known, what percentage of the students scored between 440 and 520?
A) at least 75%
B) approximately 95%
C) at least 88.9%
D) approximately 68%

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The Answer of A study was designed to investigate the effects of two variables - (1) a studentʹs level of mathematical anxietyand (2) teaching method - on a studentʹs achievement in a mathematics course. Students who had a low levelof mathematical anxiety were taught using the traditional expository method. These students obtained a meanscore of 480 with a standard deviation of 20 on a standardized test. Assuming no information concerning theshape of the distribution is known, what percentage of the students scored between 440 and 520?
A) at least 75%
B) approximately 95%
C) at least 88.9%
D) approximately 68%

A Study Was Designed to Investigate the Effects of Two