If a certain sample of data has a mean of 10.0 and a standard deviation of 2.0, which of the following pairs contain two values that are each at least 2.5 standard deviations from the mean?  Pick:
A) (5.0; 16.5)
B) (8.5; 21.0)
C) (14.0; 26.5)
D) (16.5; 26.0)
E) (21.0; 26.5)
2.5 standard deviation equals to 2.5*2= 
<gadget id="calculator">2.5*2</gadget>
<output>5</output>
5;   2.5 standard deviations from the mean, so5 points, from the mean is the range from {mean-5} to {mean+5}, so from 5 to 15:   The correct answer choice must cover all this range: only answer choice A does this.   (5.0; 16.5)nswer:(5.0; 16.5).
<result>A</result>
If a certain sample of data has a mean of 10.0 and a standard deviation of 2.0, which of the following pairs contain two values that are each at least 2.5 standard deviations from the mean?