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A teacher gives a 15 item science test. For each item, a student receives one...

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Basic Math

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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.

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