On a test, the mean score for a class of 100 students is 80 and the standard deviation of the scores is 10. The professor who gave the test then realizes that she made a scoring error, which she corrects by adding 5 points to each student's score. The standard deviation of the students' new scores is?

10

Explanation:

In simple terms, the standard deviation is the average distance of the scores from the mean. If all the scores are increase by the same value (in the case, 5) the average distance from the mean stays the same.

answer: all of the above

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