The average grade in a quiz was 20.0, with a standard deviation of 4.0. The grades follow
Question:
The average grade in a quiz was 20.0, with a standard deviation of 4.0. The grades follow the normal distribution.
a. Compute the z-value for a grade of 25.0.
b. What proportion of students achieved a grade between 20.0 and 25.0?
c. What proportion of students achieved a grade less than 18.0?
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Related Book For 
Basic Statistics For Business & Economics
ISBN: 9781259268939
6th Canadian Edition
Authors: Douglas A. Lind, William G Marchal, Samuel A. Wathen, Carol Ann Waite
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