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Mathematics 7 Online
Cyber:

Suppose you score 80 on your first psychology test. The mean for the class is 70, and the standard deviation is 5. On the second test, you receives score of 90. This time the mean for the class is also 70, but the standard deviation is 20.Compared to the other students in your class, did your performance improve, deteriorate, or stay the same?

Imagine:

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