document.write( "Question 958774: Four Friends are told that the average (mean) of their grades for their favorite class is 84%\r
\n" ); document.write( "\n" ); document.write( "Jack got 91%, Hailey got 72%, and Taylor got 80%
\n" ); document.write( "Kevin's grade was not revealed.
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Algebra.Com's Answer #585970 by macston(5194)\"\" \"About 
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To have an average of 84%, the sum of four grades must be 4(84)=336
\n" ); document.write( "The sum of the other three grades is 91+72+80=243
\n" ); document.write( "So Kevin's grade must be 336-243=93. ANSWER: Kevin's grade was 93%,
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