A teacher gives a 15 item science test. For each item, a student receives one point for a correct answer; 0 points for no

Question

A teacher gives a 15 item science test. For each item, a student receives one point for a correct answer; 0 points for no answer, and loses one point for an incorrect answer. Total test scores could range from +15 points to -15 points. The teacher computes the standard deviation of the test scores for the class to be -2.30. What do we know?
A. The standard deviation was calculated incorrectly.
B. Most students received negative scores.
C. Most students scored below the mean.
D. None of the above.

Kunduz · Accepted Answer

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