SOLUTION: Nadia has taken 55 tests and her average score so far is 79. If she gets 100, a perfect score, on the remaining 2 tests, what will her new average be?

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Question 969806: Nadia has taken 55 tests and her average score so far is 79.
If she gets 100, a perfect score, on the remaining 2 tests, what will her new average be?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
79.74 ANSWER
She has an average from 55 tests. Two perfect tests will change the average but not much, because they are a small number compared to 55.
The mean is the average of all the tests.
mean=total/number.
The total score is mean* number (multiply both sides of the equation by number).
79*55=total =4345
Two more tests, and the total has increased 200 (100 on each test). It is now 4545.
The number of tests has increased 2, to 57.
The new average (or mean; the two words are the same)=4545/57
79.74