posted by Joe on .
John's z-score on a college entrace exam is 1.3. If the raw scores have a mean of 480 and a standard deviation of 70 points, what is his raw score?
Use a z-score formula to find John's raw score.
The formula: z = (x - mean)/sd -->sd = standard deviation
Using what you know to find what you don't know:
1.3 = (x - 480)/70
Solve for x.
I hope this will help.