The scores of 5 people are 80, 90, 85, 95 and 100 respectively. What is the new standard deviation of their scores after the following changes?
(1) Add 10 points to everyone`s score
(2) Change the average score to 85.5
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AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
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BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
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CBOTH statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
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DEACH statement ALONE is sufficient.
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EStatements (1) and (2) TOGETHER are NOT sufficient.
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正确答案: A