Question 265238: If a student had taken six tests and recieved scores of 88, 73,81,83,79 and 94 what would the 7th test score have to be to have a mean score of 83?
Found 2 solutions by dabanfield, drk:
Answer by dabanfield(803)   (Show Source):
You can put this solution on YOUR website! If a student had taken six tests and recieved scores of 88, 73,81,83,79 and 94 what would the 7th test score have to be to have a mean score of 83?
The average is given by the sum of the seven scores divided by the number of scores (that is 7). If X is the score on the 7th test then:
(88+73+81+83+79+94+X)/7 = 83
Solve the above for X.
Answer by drk(1908) (Show Source):
You can put this solution on YOUR website! We want an average of 83 for 7 tests. Think totals. So, 7 x 83 = 581 is what we need.
So far we have 88, 73, 81, 83, 79, 94 which sums to 498
The difference is 83.
So, you need an 83 on test 73 to get 83 in the class.
-----
alternate approach
(88+73+81+83+79+94+x)/7 = 83
(498+x) = 581
x = 83
|
|
|
