document.write( "Question 581814: six scores have a mean of 8. What must the 7th score be to increase the mean by 1? \n" ); document.write( "
Algebra.Com's Answer #371828 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
S/6 = 8\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "S = 8*6\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "S = 48\r
\n" ); document.write( "\n" ); document.write( "------------------\r
\n" ); document.write( "\n" ); document.write( "(S + x)/7 = 8 + 1\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "(48 + x)/7 = 8 + 1\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "(48 + x)/7 = 9\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "48 + x = 9*7\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "48 + x = 63\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "x = 63-48\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "x = 15\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "So the 7th score must be 15
\n" ); document.write( "
\n" );