To express: the given quantity in terms of the indicated variable.
The given quantity is “the average of four quiz score”.
The average of each of the first three scores is respectively.
And the forth quiz score is q.
Average is to find by sum of all terms divided by number of terms.
According to question, the average first three score is 8.
Therefore, sum of three score is
And the fourth quiz score is q.
As the average is to find by sum of all terms divided by number of terms.
Hence,the average of four quiz scoreis .
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