SOLUTION: Mary receives a score of 43 on her chemistry test. The teacher says Mary�s raw test score is equivalent to a z-score of 2.1. Compared to her classmates, how well did Mary do?

Question 655395: Mary receives a score of 43 on her chemistry test. The teacher says Mary�s raw test score is equivalent to a z-score of 2.1. Compared to her classmates, how well did Mary do?
what's the standard deviation?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Mary receives a score of 43 on her chemistry test. The teacher says Mary�s raw test score is equivalent to a z-score of 2.1. Compared to her classmates, how well did Mary do?
what's the standard deviation?
----
All you can say from that information is that Mary's 43 is 2.1 standard
deviations above the mean. She did better than normalcdf(-100,2.1) = 98%
of the class.
The information given does not reveal the size of the standard deviation.
=================
Cheers,
Stan H.
RELATED QUESTIONS
Police departments use exams as part of their promotion process and officers have to... (answered by Boreal)

I don't understand how to do these, I have researched all day. Please help. Which is... (answered by John10)

Police departments use exams as part of their promotion process and officers have to... (answered by Theo)

this is the second one. 2.the test scores of students on a particular subject is... (answered by stanbon)

6. Which is relatively better: a score of 76 on a psychology test or a score of 33 on an... (answered by CubeyThePenguin)

1. Which is relatively better: a score of 76 on a psychology test or a score of 33 on an... (answered by CubeyThePenguin)

A group of scores has a mean of 23.5 and a standard deviation of 4.9. Your raw score is... (answered by Fombitz)

A group of scores has a mean of 320 and a standard deviation of 18. Your raw score is... (answered by Fombitz)