Homework Help: statistics

Posted by Lisa on Tuesday, May 10, 2011 at 10:21pm.

In a population of normally distributed aptitude scores of 1000 academy students with mean 70 and Standard deviation 10, how many score above 95?

statistics - PsyDAG, Wednesday, May 11, 2011 at 1:05pm
Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to that Z score.

Multiply that proportion by 1000. (Round to whole students.)

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