document.write( "Question 619350: “student must have an average(the mean) on five tests that is greater than or equal to 80% but less than 90% to recieve a final grade of a B Devons grades on the first four tests were 76%,65%,90%, and 80%What range of grades on the fifth test would give him a B in the course? \n" ); document.write( "

Algebra.Com's Answer #389615 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( "first four tests(80% of grade) were 76%,65%,90%, and 80%   Average = 77.75
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document.write( "student must have an average(the mean) on five tests that is greater than 
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document.write( "or equal to 80% but less than 90% to recieve a final grade of a B
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document.write( " .80(77.75) + .20x ≥ .80
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document.write( "               .20x ≥ 80 - 62.8
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document.write( "                  x ≥ 17.2/.2
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document.write( "                  x ≥ 86  ***** B the highest grade possible\r
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document.write( "              .20x < 90 - 62.8
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document.write( "                 x ≥ 27.2/.2
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document.write( "                  x ≥ 138%\r
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