Scores on a Math Midterm are distributed under a standard normal curve. A randomly selected student had a score of 55, which represented a z score of -2.35. If the mean for the exam was 76, determine the standard deviation for the exam.

Please if you could show me how to do it as well as the answer that would be much appreciated :) thanks

Question

Scores on a Math Midterm are distributed under a standard normal curve. A randomly selected student had a score of 55, which represented a z score of -2.35. If the mean for the exam was 76, determine the standard deviation for the exam.

Please if you could show me how to do it as well as the answer that would be much appreciated :) thanks

anonymous · Answer

76-55=21

21=2.35 sigma.  I think you can probably figure it out from here....

anonymous · Answer

My calculator gives a number a little less than nine.