Set S has a mean of 10 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? Options:
A) {9, 11} B) {2, 10} C) {10, 18} D) {7, 13} E) {16, 16}
answer B,C, and E mean is not 10 therefore not accepted . D mean is 10 but S.D is more. therefore accepted   answer is A mean is 10 and S.D decreases minimum.   {9, 11}
<result>A</result>
Set S has a mean of 10 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?