Homework Help: math (statistics

Posted by Joe on Thursday, January 18, 2007 at 9:25pm.

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.

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