document.write( "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?\r
\n" ); document.write( "\n" ); document.write( "How can I solve this using a calculator? \n" ); document.write( "

Algebra.Com's Answer #668443 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!
mean score of 280 with a standard deviation of 50
\n" ); document.write( "z = invNorm(.997) = 2.7478
\n" ); document.write( " $\"z+=blue+%28x+-+mu%29%2Fblue%28sigma%29\"$
\n" ); document.write( " $\"blue%28sigma%29%2Az+%2B+mu=blue+%28x%29\"$
\n" ); document.write( "50(2.7478) + 280 = x (Score is given as the next nearest integer)\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );