document.write( "Question 637592: the average of 5 test scores is a 78. what is the fifth score if the first 4 scores are 71, 92, 68, and 84? \n" ); document.write( "
Algebra.Com's Answer #401764 by w_parminder(53)\"\" \"About 
You can put this solution on YOUR website!
Average of 5 test scores = 78
\n" ); document.write( "So sum of 5 test scores = 78*5 = 390
\n" ); document.write( "Sum of first 4 test scores = 71+92+68+84 = 315
\n" ); document.write( "So the fifth score = 390-315 = 75
\n" ); document.write( "
\n" );