SOLUTION: 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 mathemati

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Question 1053146: 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 280 with a standard deviation of 50 on a standardized test. Assuming a bell-shaped distribution, where would approximately 99.7% of the students score?
How can I solve this using a calculator?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
mean score of 280 with a standard deviation of 50
z = invNorm(.997) = 2.7478
z+=blue+%28x+-+mu%29%2Fblue%28sigma%29
blue%28sigma%29%2Az+%2B+mu=blue+%28x%29
50(2.7478) + 280 = x (Score is given as the next nearest integer)