Homework Help: Math

Posted by Angie on Tuesday, November 13, 2012 at 10:41pm.

Dorian's score of 558 on the writing portion of the 2009 SAT exam placed him in the 72nd percentile. If the mean on this exam was 493, what was the standard deviation?

Math - PsyDAG, Wednesday, November 14, 2012 at 11:04am
Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion (.72) and its Z score. Insert the Z score and other data in the equation above and solve for SD.

Answer this Question

Related Questions

statistics - SAT Exam Scores – A school administrator wonders if students ...
Stats - Suppose the correlation between SAT Verbal scores and Math scores is 0....
statistics - Bob scores 610 on his SAT's. If the mean score is 580 and the ...
Math - For a normally distributed distribution of variable x, where the mean is ...
CRJ303-Statistics question - Re-worded from the "Study Questions" part...
Math - Exam scores were normal in MIS 200. Jason's exam score was 1.41 ...
bus. stats - Given that math SAT scores are normally distributed (follow the ...
bus. stats - Given that math SAT scores are normally distributed (follow the ...
Statistics - Suppose the correlation between SAT Verbal scores and Math scores ...
statistics in psychology - An analysis of the combined SAT scores (Verbal + ...

For Further Reading

First Name:
School Subject:
Answer: