document.write( "Question 1176222: Nyiem scores a 99, 86,76 and 95 what grade would he need on the next exam to have an average of 91
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Algebra.Com's Answer #802611 by greenestamps(13203)\"\" \"About 
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\n" ); document.write( "A standard approach:
\n" ); document.write( "(1) find the sum of the four scores shown
\n" ); document.write( "(2) calculate 91*5, which is the total number of points required for him to have an average of 91 for the five tests
\n" ); document.write( "(3) the difference between (1) and (2) is the score he needs to get on the 5th test

\n" ); document.write( "An alternative method that is often faster and easier if the numbers being averaged are all \"close together\":
\n" ); document.write( "(1) determine how far over or under the desired average each current score is
\n" ); document.write( "(2) add up all those differences
\n" ); document.write( "(3) find the score on the 5th test that balances the total from (2)

\n" ); document.write( "For this problem....
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document.write( "1st test: 99  = + 8\r\n" );
document.write( "2nd test: 86  = - 5\r\n" );
document.write( "3rd test: 76  = -15\r\n" );
document.write( "4th test: 95  = + 4\r\n" );
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document.write( "total:          - 8

\n" ); document.write( "His total scores on the four tests is 8 points below what he needs to get an average of 91; to balance that, his score on the 5th test has to be 8 points above the desired average.

\n" ); document.write( "ANSWER: His score on the 5th test must be 91+8=99 to get an average of 91 on the 5 tests.

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