Homework Help: statistics

Posted by kelly on Saturday, February 9, 2013 at 3:43pm.

the mean scale score on the mathematics examination of ninth grade students in new york state was 86 with a standard deviation of 5 points. Given a student was selected at random what is the probabilty that his score was 91 or higher?

statistics - PsyDAG, Sunday, February 10, 2013 at 1:12pm
Z = (score-mean)/SD

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

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