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?
Stacey Warren - Expert brainly.com
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Ok. Sorry I couldn't help. When is it due?
Aite. I'll post an answer here when I'm back in an hour or two.
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and no one else is answering it i keep postin git
did you get the answer for this question yet?
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.