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Blair’s average (arithmetic mean) on two physics tests is 7. What should Blair’s score be on the next test to have an overall average of 8 for all the tests?

A 10
Explaination
The arithmetic mean is defined as the sum of the terms divided by the number of terms. To have an overall average of 8, $4237_w110_h38.png$ then x=10.
B 7
C 8
D 9