Math
posted by David on .
You have a mean score of 86 on 9 quizzes. The teacher decides to drop your lowest quiz score to determine your final quiz mean. After dropping the lowest score, your mean score on the 8 remaining quizzes is 88. What score was dropped?

let the score that was dropped be x
total of all the marks on 9 quizzes = 86*9 = 774
then (774x)/8 = 88
solve for x
(hope you get 70) 
sum/9 = 86
sum = 9*86 = 774
(sum  x)/8 = 88
sum  x = 704
774  x = 704
x = 774  704
x = 70 
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