Question 762293: Jerome's score on four tests are 89,71, 87 and 75. What must his score on the next test be so that his average will be 82? Answer by 2897696(96) (Show Source):
You can put this solution on YOUR website! Average: when you add number together and divide the sum by the total of numbers added.
let x = unknown test%
==>add all test% including the unknown/by number of test add= to the average wanted
Equation:
(89+71+87+75+x)/5=82
Solve for x
322+x=410
x=78%
So the test score needed is 78%.