If the average (arithmetic mean) of a list of numbers is 12 and the standard deviation of that list of numbers is 1.3, then which of the following numbers is more than two standard deviations from the mean?
I. 13.2
II. 12.3
III. 9.3 Choose the correct choice:  A) I only  B) I and II only  C) II only  D) III only  E) I and III only
Mean = 12   SIII only = 1.3   2 SIII only above mean = 12+2*1.3= 
<gadget id="calculator">12+2*1.3</gadget>
<output>14.6</output>
14.6   2 SIII only below mean= 12-2*1.3= 
<gadget id="calculator">12-2*1.3</gadget>
<output>9.4</output>
9.4   12.3 and 13.2 lies in the range of 2SIII only from mean   Answer: Option III only
<result>D</result>
If the average (arithmetic mean) of a list of numbers is 12 and the standard deviation of that list of numbers is 1.3, then which of the following numbers is more than two standard deviations from the mean?
I. 13.2
II. 12.3
III. 9.3