document.write( "Question 1185722: Let us assume that the grades of 500 students are normally distributed with 𝜇=45 and standard deviation 𝜎=20. If the 20% of the students get excellent, what is the grade that determines the excellent? (What is 𝛸 value?) \n" ); document.write( "
Algebra.Com's Answer #816562 by Edwin McCravy(20060)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "On your T-84, assuming first that it's a later model.\r\n" );
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document.write( "Press 2ND VARS 3\r\n" );
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document.write( "Make the screen read\r\n" );
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document.write( "               invNorm\r\n" );
document.write( "area:0.20\r\n" );
document.write( "μ:45\r\n" );
document.write( "σ:20\r\n" );
document.write( "Tail: LEFT CENTER RIGHT\r\n" );
document.write( "Paste\r\n" );
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document.write( "Use the down arrow key to scroll to highlight RIGHT, \r\n" );
document.write( "press ENTER to highlight. Then scroll to Paste and press \r\n" );
document.write( "ENTER again.\r\n" );
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document.write( "You'll see this:\r\n" );
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document.write( "invNorm(0.20,45,20,RIGHT)\r\n" );
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document.write( "Press ENTER\r\n" );
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document.write( "Read 61.83242467           <-- X value\r\n" );
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document.write( "Round the way you were told.\r\n" );
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document.write( "If your calculator is too old to have \"LEFT CENTER RIGHT\", \r\n" );
document.write( "then it reads only left, so you'll have to make it read:\r\n" );
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document.write( "invNorm(1-0.20,45,20) then press ENTER.\r\n" );
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document.write( "Edwin
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