题目信息
Is the standard deviation of the set of measurements $${x}_{1}$$, $${x}_{2}$$, $${x}_{3}$$, $${x}_{4}$$,....$${x}_{20}$$ less than 3 ?
(1) The variance for the set of measurements is 4.
(2) For each measurement, the difference between the mean and that measurement is 2.
(1) The variance for the set of measurements is 4.
(2) For each measurement, the difference between the mean and that measurement is 2.
A:Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B:Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C:BOTH statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D:EACH statement ALONE is sufficient.
E:Statements (1) and (2) TOGETHER are NOT sufficient.
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正确答案：
D:EACH statement ALONE is sufficient.
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