Set R has a mean of 14 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 option
A) {13,15}  B) {18,19}  C) {11,19}  D) {15,19}  E) {14,25}
The lesser the variance( values closer to mean) ,lower the standard deviation. As discussed in question the mean is 14,the values (13,15) are closer than others.   Hence {13,15}nswer : {13,15}
<result>A</result>
Set R has a mean of 14 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?