SOLUTION: David has scored 81, 89, 94, and 81 on his previous four tests. What score does he need on his next test so that his average (mean) is 81 ?

Question 663956: David has scored 81, 89, 94, and 81 on his previous four tests. What score does he need on his next test so that his average (mean) is 81 ?
Answer by ReadingBoosters(3246) (Show Source): You can put this solution on YOUR website!
Just in case you are yet in need of a solution...

Combine like terms

Multiply both sides by 5
345+x = 405
Group like terms
x = 405 - 345 = 60
x=60 is the next score for an average of 81
........................
Delighted to help.
-Reading Boosters
Wanting for others what we want for ourselves.
www.MyHomeworkAnswers.com
RELATED QUESTIONS
Chang has scored 87,94 ,89 , and 93 on his previous four tests. What score does he need... (answered by TeishaRenee)

Austin has scored 81, 86,89 ,81 , and 64 on his previous five tests. What score does he... (answered by 1412)

Charlie has scored 89, 78, and 63 on his previous three tests. What score does he need on (answered by ikleyn,greenestamps)

Ryan has scored 74,86 ,75 ,69 and on his previous four tests. What score does he need on... (answered by reviewermath)

Ryan has scored , , , and on his previous four tests. What score does he need on his next (answered by Alan3354)

Keith has scored 84,75,81, and 80 on his previous four tests. What score does he need on... (answered by ewatrrr)

Manuel has scored 82, 91, 73, 75, and 93 on his previous five tests. What score does he... (answered by Cromlix)

Aldo has scored 83 , 69 , 92 , 92 , and 90 on his previous five tests.... (answered by solver91311,MathLover1)

Alan has scored 78 , 93 , 63 , 81 , and 76 on his previous five tests.... (answered by jorel555,Alan3354,acw1213)