If a sample of data has mean of 24 and SD of 3, which of the following values is more than 2.5 SDs from the mean?  Choose the correct choice from the following answers:
A) a. 19 B) b. 18.5 C) c. 15 D) d. 23.5 E) e. 26.5
Value ismore than 2.5SDfrom the mean means that the distance between the mean and the value must be more than 2.5SD=7.5. So the value either &lt; 24-7.5= 
<gadget id="calculator"> 24-7.5</gadget>
<output>16.5</output>
16.5 or &gt;24+7.5=31.5.   Answer: c. 15.
<result>C</result>
If a sample of data has mean of 24 and SD of 3, which of the following values is more than 2.5 SDs from the mean?