Homework Help: statistics

Posted by Anonymous on Friday, December 24, 2010 at 5:56pm.

The average (arithmetic mean) of a normal distribution of a school's test scores is 65, and standard deviation of the distribution is 6.5. A student scoring a 78 on the exam is in what percentile of the school?

statistics - drwls, Friday, December 24, 2010 at 7:01pm
Her score is 2 standard deviations above the mean. Only 2.3% are higher.

Call it the 97th percentile
statistics - drwls, Friday, December 24, 2010 at 7:04pm
For a useful online tool for this type of question, see
http://psych.colorado.edu/~mcclella/java/normal/accurateNormal.html

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