Question
The results from a statistics class' first exam are as follows: The average grade obtained on the exam by its 45 students is an 85,
The results from a statistics class' first exam are as follows: The average grade obtained on the exam by its 45 students is an 85, with a standard deviation of 15 points. Answer the following based on this information:
Approximately how many people received a failing grade (less than 65)?
What percentage of people received a grade between a 70 and a 91?
What percentage of individuals received a score whose z-score was -.70 or less?
What grade is required in order to be in the top 30 percent?
What grade is required in order to be in the top 20 percent?
What percentage of people received a grade between 89 and 95?
What percentage of people received a grade of 94 or less?
What grade is required to be in the bottom 20%?
What z-score is required to be in the top 40%?
What percentage of individuals have a z-score between -1 and 1.40?
What percentage of individuals have a z-score between 1.05 and 1.40?
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Finite Math And Applied Calculus
Authors: Stefan Waner, Steven Costenoble
2nd Edition
0534366309, 9780534366308
