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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?
10
7
8
9
Detailed Explanation
The arithmetic mean is defined as the sum of the terms divided by the number of terms. To have an overall average of 8, \([ \frac{\mathrm{7 \times 2+x} }{\mathrm{3} } = 8 ] \) then x=10.
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