(Answered) A distribution of exam scores in sociology 100 for the past

Engineering

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

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

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