Posted by **kelly** on Sunday, February 10, 2013 at 4:01pm.

The mean scale score on the mathematics examinatin of ninth graders in Texas was 86 with a standard deviation of 5 points. Given a student was selected at random what is the probability that his score was 91 or higher

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**MathGuru**, Sunday, February 10, 2013 at 5:50pm
See your other post.

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