# math (statistics

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.