Homework Help: statistics

Posted by grace on Wednesday, April 25, 2012 at 1:46pm.

On an exam whose scores followed a normal distribution, a student's z-score was
+2.
What percentage of students scored better than he did? (Use the 68-95-99.7 Rule.)

statistics - PsyDAG, Thursday, April 26, 2012 at 12:06pm
Since you are only interested in number above Z = +2, you cannot apply the rule.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion for that Z score. Multiply by 100.

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