Asked by felicia

Tim wants his mean (average) quiz score in history class to be 90. His first 3 quiz scores were 86, 92, and 94. What score should he make on the 4th quiz in order to have a mean (average) quiz score of exactly 90?



I really need the answer ! PLZ PLZ PLZ ! cant figure it outtt !!!! -___-
Answered by felicia
Nvmd yo ! I got it !
Answered by Bosnian
x1 + x2 + x3 = 86 + 92 + 94 = 272


( x1 + x2 + x3 + x4 ) / 4 = 90

( 272 + x4 ) / 4 = 90 Multiply both sides by 4

272 + x4 = 90 * 4

272 + x4 = 360

x4 = 360 - 272 = 88
Answered by Anonymous
Tim wants his mean (average) quiz score in history class to be 90. His first 3 quiz scores were 86, 92, and 94. What score should he make on the 4th quiz in order to have a mean (average) quiz score of exactly 90?
Answered by Anonymous
is mean (average) quiz score in history class to be 90. His first 3 quiz scores were 86, 92, and 94. What score should he make on the 4th quiz in order to have a mean (average) quiz score of exactly 90?
Answered by nahhhh
wow
There are no AI answers yet. The ability to request AI answers is coming soon!