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What is the z score for a person who achieved 90

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Reference no: EM132024669

A distribution of exam scores in Sociology 100 for the past five years has a mean of 75 and a standard deviation of 20.

  1. What is the Z score for a person who achieved 90?
  2. What is the Z score of a person who achieved 40?
  3. What percentage of students earned a grade of 80 or better?
  4. What scores represent the middle 75% of the distribution?

Reference no: EM132024669

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