SOLUTION: Scores on a math midterm are distributed under a standard normal curve. A randomly selected had a score of 55, which represented a z score of -2.35. If the mean for the exam was 76

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Question 627336: Scores on a math midterm are distributed under a standard normal curve. A randomly selected 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.
Does one have to use a graphing calculator to solve most of these types of question?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi, Calculator will do

*Note: z+=+blue%28x+-+mu%29%2Fblue%28sigma%29

  z = %2855+-+76%29%2FSD = -2.35

          SD = -21%2F-2.35 = 8.9362