Homework Help: statistics

Posted by Abby on Tuesday, December 14, 2010 at 2:09am.

Scores on the ACT test are normally distributed with a mean of 21.1 and a standard deviation of 4.8. If one ACT score is randomly selected, find the probability that it is greater than 20.

statistics - TutorCat, Tuesday, December 14, 2010 at 2:18am
Find the z-score.
http://www.ehow.com/how_4555631_calculate-zscore-statistics.html

Then look up the p value on the z table.

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