To express: the given quantity in terms of the indicated variable.
The given quantity is “the average of three test score”.
The first two scores are respectively.
Average is to find by sum of all terms divided by number of terms.
According to question, the first two score are:
And the third score is s.
As the average is to find by sum of all terms divided by number of terms.
Hence,the average of three test scoreis .
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