Question 265238
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.
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alternate approach
(88+73+81+83+79+94+x)/7 = 83
(498+x) = 581
x = 83