Set R has a mean of 11 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 answers.
A) {15, 13}	B) {11, 14}	C) {10, 12}	D) {14, 19}	E) {14, 11}
The lesser the variance( values closer to mean) ,lower the standard deviation. As discussed in question the mean is 11,the values (10,12) are closer than others.   Hence Answer : {10, 12}
<result>C</result>
Set R has a mean of 11 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?