Set S has a mean of 16 and a standard deviation of 1.5. We are going to add two additional numbers to Set S. Which pair of numbers would decrease the standard deviation the most?	Choose the correct choice from the following options
A) {2, 10}	B) {9, 11}	C) {16, 16}	D) {10, 18}	E) {7, 13}
answer A,B,D, and E mean is not 16 therefore not accepted . C mean is 16 but S.D is more. therefore accepted   answer is C mean is 16 and S.D decreases minimum.   {16, 16}
<result>C</result>
Set S has a mean of 16 and a standard deviation of 1.5. We are going to add two additional numbers to Set S. Which pair of numbers would decrease the standard deviation the most?