document.write( "Question 1095098: Twelve students took a math exam and obtained an average score of 80%. If four students received an A grade (a score of 90% or above), then what was the minimum possible percentage mean score of the other students? \n" ); document.write( "
Algebra.Com's Answer #709668 by greenestamps(13200)![]() ![]() You can put this solution on YOUR website! Josgarithmetic said get a second opinion.... Her answer is fine; but I would solve the problem differently.... \n" ); document.write( "If we are looking for the minimum average of the other 8 students, then we want the 4 students who got A's to get the highest possible score, which I will assume is 100. \n" ); document.write( "Let's talk scores out of 100 instead of percentages, to make the description easier.... \n" ); document.write( "The average is 80, and 4 students each scored 100. That is a total of 4*20=80 points above what is needed to make an average of 80. That means the average for the other 8 students must be such that their total scores are 80 below the overall average of 80. 80 points, divided equally among the 8 students, is 10 points each. So the average of the other 8 students is 10 points below the overall average of 80; 80-10 = 70. \n" ); document.write( " |