SOLUTION: Dorians score of 572 on the normally distributed verbal portion of the 1996 SAT exam placed him at the seventy third percentile. If the mean on this exam was 505, what was the stan

Question 581441: Dorians score of 572 on the normally distributed verbal portion of the 1996 SAT exam placed him at the seventy third percentile. If the mean on this exam was 505, what was the standard deviation? Please help me with this!
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Dorians score of 572 on the normally distributed verbal portion of the 1996 SAT exam placed him at the seventy third percentile. If the mean on this exam was 505, what was the standard deviation?
----
The 73rd%ile score has a left tail of 73%
---
Find the corresponding z-value:
invNorm(0.73) = 0.6128
------
Then use x = z*s + u to solve for "s":
572 = 0.6128*s + 505
----
67 = 0.7128s
s = 109.33
=================
Cheers,
Stan H.
RELATED QUESTIONS
In 2005, the mean score on the verbal portion of the SAT for college-bound seniors was... (answered by rothauserc)

Scores for men on the verbal portion of the SAT-I test are normally distributed with a... (answered by ewatrrr)

The actual odds against Tom getting a score of at least 1400 on the SAT... (answered by greenestamps)

The average score on the math portion of the SAR was 516 in 2002. Suppose that the math... (answered by ikleyn)

SAT verbal scores are normally distributed with a mean of 430 and a standard deviation... (answered by edjones)

The national average for the verbal portion of the College Board's SAT is 507. The... (answered by stanbon)

In order to be accepted into a top university, applicants must score within the top 5% on (answered by Boreal)

The actual odds in favor of Tom getting a score of at least 1400 on the SAT... (answered by greenestamps)

I'm stuck on this :/ some one please help SAT verbal scores are normally distributed (answered by edjones)