Question 142135
The formula for determining a z-score on a mathematical portion of the SAT is given by   z=(x-518)/115 where x is an individual score on the test.  The value 518 is the national average score on the test, whereas 115 is a measure of how spread out the scores are.

1.  Solve this formula for x in terms of z.
x-518 = 115z
x = 115z+518
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2.  If your z-score is 2.2, what was your x-score on the test?
x = 115*2.2 +518
x = 771
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Cheers,
Stan H.