## anonymous 5 years ago On a standardized test with a normal distribution, the mean was 64.3 and the standard deviation was 5.4. what percentile is a 74?

1. anonymous

Ok. Sorry I couldn't help. When is it due?

2. anonymous

tomorrow

3. anonymous

Aite. I'll post an answer here when I'm back in an hour or two.

4. anonymous

and no one else is answering it i keep postin git

5. anonymous

did you get the answer for this question yet?

6. anonymous

First step is to find the z-score of the number 74. To do this, we use the formula $z = (x - \mu)/\sigma$ Where x = 74; $\mu= 64.3 (Mean)\ ; \sigma = 5.4 (Standard- deviation)$ So z = 1.7962. Now for the second step, if my memory serves me correctly, would be to look in the back of your statistics book for the table that relates the z-score to an area or percentile. Hope this helps; sorry I couldn't respond sooner or with the complete answer to the problem.