Author Question: Given a normally distributed variable with a mean of 70 and a standard deviation of 10, which of the ... (Read 80 times)

Mimi · **on:** Jul 12, 2018

Given a normally distributed variable with a mean of 70 and a standard deviation of 10, which of the following is the most appropriate statement?

A. 50 of all cases fall within one standard deviation of the mean.
B. Approximately 95 of all cases fall within the range 60 to 80.
C. Approximately 68 of all cases fall within the range 60 to 80.
D. None of the above is correct.

Question 2

Lets say that after this exam is graded, you receive a percentage on the exam and a Z-score. Lets say that your Z-score for this exam is 3.0. In comparison with other students scores, would this mean that you did really well on the exam, really badly on the exam, or about the same as most people?

A. You did really well on the exam in comparison with others.
B. You did really badly on the exam in comparison with others.
C. You were about the same as most other students.
D. It cant be determined on the basis of this information.