document.write( "Question 596909: 1. A student has earned scores of 87, 81, and 88 on the first 3 of 4 tests. If the student wants an average (arithmetic mean) of exactly 87, what score must she earn on the fourth test?
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document.write( "A. 85
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document.write( "B. 86
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document.write( "C. 87
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document.write( "D. 92
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document.write( "E. 93
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Algebra.Com's Answer #377943 by jim_thompson5910(35256)![]() ![]() ![]() You can put this solution on YOUR website! Let x = fourth test score\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "(87+81+88+x)/4 = 87\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "87+81+88+x = 87*4\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "87+81+88+x = 348\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "256+x = 348\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "x = 348-256\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "x = 92\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "So the answer is choice D \n" ); document.write( " |